feat: Introduce new slots and classes for enhanced heritage data modeling

- Added `has_or_had_place_of_birth` slot to capture structured birth place information with historical context. - Introduced `has_or_had_quantity` slot for capturing quantified values with units and provenance. - Created `has_or_had_service_area` slot to define geographic service areas for heritage custodians. - Implemented `is_or_was_approximate` slot to indicate uncertainty in values (dates, quantities). - Added `is_or_was_asserted_by` slot to track the agent responsible for assertions. - Introduced `Asserter` class to model agents making assertions, including types like human, automated, and AI. - Created `Quantity` class to represent quantified values with optional units and types. - Added enums for `AsserterTypeEnum` and `QuantityTypeEnum` to standardize types of asserters and quantities. - Archived outdated slots and replaced them with new structured alternatives following RiC-O conventions.
2026-01-14 16:54:10 +01:00 · 2026-01-14 16:54:10 +01:00 · 6da794ee38
commit 6da794ee38
parent 4acdab5b4e
70 changed files with 4086 additions and 445 deletions
--- a/frontend/public/schemas/20251121/linkml/modules/classes/ApproximationStatus.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/ApproximationStatus.yaml
@ -0,0 +1,149 @@
+id: https://nde.nl/ontology/hc/class/ApproximationStatus
+name: approximation_status_class
+title: ApproximationStatus Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  rico: https://www.ica.org/standards/RiC/ontology#
+  skos: http://www.w3.org/2004/02/skos/core#
+imports:
+- linkml:types
+- ../metadata
+- ../slots/approximation_level
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+default_prefix: hc
+classes:
+  ApproximationStatus:
+    class_uri: hc:ApproximationStatus
+    description: >-
+      Status indicating the level of approximation or uncertainty for a value.
+      
+      **PURPOSE**:
+      
+      ApproximationStatus captures structured uncertainty information for values
+      like dates, quantities, and measurements where precision varies. This
+      replaces simple boolean "approximate: true/false" with richer modeling.
+      
+      **UNCERTAINTY LEVELS**:
+      
+      | Level | Label | Description | Example |
+      |-------|-------|-------------|---------|
+      | EXACT | Exact | Known with certainty | "1880-03-15" |
+      | APPROXIMATE | Approximate | Close but not exact | "circa 1880" |
+      | ESTIMATED | Estimated | Calculated/inferred | "estimated 1875-1885" |
+      | UNCERTAIN | Uncertain | Significant doubt | "possibly 19th century" |
+      | UNKNOWN | Unknown | Cannot be determined | "date unknown" |
+      
+      **CIDOC-CRM ALIGNMENT**:
+      
+      CIDOC-CRM models time-span precision through E52_Time-Span with fuzzy
+      boundaries. ApproximationStatus provides a complementary vocabulary for
+      expressing certainty levels.
+      
+      **USE CASES**:
+      
+      1. **Date Uncertainty**: Founding dates known only to decade
+      2. **Quantity Estimates**: Collection size approximations
+      3. **Location Precision**: Address known only to city level
+      4. **Historical Events**: Uncertain timing of organizational changes
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      event_date: "1880"
+      is_or_was_approximate:
+        approximation_level: APPROXIMATE
+        has_or_had_label: "circa 1880"
+        has_or_had_description: "Founding date known only to year from secondary sources"
+      ```
+    exact_mappings:
+      - crm:E52_Time-Span
+    close_mappings:
+      - rico:DateType
+    related_mappings:
+      - skos:note
+    slots:
+      - approximation_level
+      - has_or_had_label
+      - has_or_had_description
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      approximation_level:
+        range: ApproximationLevelEnum
+        required: true
+        description: >-
+          Level of approximation/uncertainty for the value.
+      has_or_had_label:
+        range: string
+        required: false
+        description: >-
+          Human-readable label for the approximation status.
+        examples:
+          - value: "circa 1880"
+            description: Approximate date label
+          - value: "approximately 10,000"
+            description: Approximate quantity label
+      has_or_had_description:
+        range: string
+        required: false
+        description: >-
+          Explanation of why the value is approximate and how uncertainty
+          was determined.
+        examples:
+          - value: "Founding date derived from secondary sources, exact day unknown"
+            description: Provenance of uncertainty
+    comments:
+      - ApproximationStatus replaces simple boolean approximate field
+      - Provides structured uncertainty modeling for dates, quantities, etc.
+      - Aligned with CIDOC-CRM E52_Time-Span precision concepts
+      - Used by is_or_was_approximate slot
+    see_also:
+      - https://www.cidoc-crm.org/Entity/e52-time-span/version-7.1.3
+    examples:
+      - value:
+          approximation_level: EXACT
+          has_or_had_label: "1880-03-15"
+        description: Exact date with full precision
+      - value:
+          approximation_level: APPROXIMATE
+          has_or_had_label: "circa 1880"
+          has_or_had_description: "Founding date known only to year from newspaper accounts"
+        description: Approximate date with explanation
+      - value:
+          approximation_level: ESTIMATED
+          has_or_had_label: "estimated 1875-1885"
+          has_or_had_description: "Date range inferred from building construction records"
+        description: Estimated date range
+      - value:
+          approximation_level: UNKNOWN
+          has_or_had_label: "date unknown"
+          has_or_had_description: "No founding records survive"
+        description: Unknown date
+    annotations:
+      specificity_score: 0.30
+      specificity_rationale: >-
+        Approximation status is broadly useful across contexts where
+        uncertainty needs to be expressed.
+
+enums:
+  ApproximationLevelEnum:
+    description: Levels of approximation/uncertainty for values.
+    permissible_values:
+      EXACT:
+        description: Value is known with certainty
+      APPROXIMATE:
+        description: Value is close but not exact (circa, roughly)
+      ESTIMATED:
+        description: Value is calculated or inferred
+      UNCERTAIN:
+        description: Significant doubt about accuracy
+      UNKNOWN:
+        description: Value cannot be determined
--- a/frontend/public/schemas/20251121/linkml/modules/classes/Asserter.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/Asserter.yaml
@ -0,0 +1,180 @@
+id: https://nde.nl/ontology/hc/class/Asserter
+name: Asserter
+title: Asserter Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  foaf: http://xmlns.com/foaf/0.1/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+imports:
+- linkml:types
+- ../enums/AsserterTypeEnum
+- ../slots/has_or_had_identifier
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  Asserter:
+    class_uri: prov:Agent
+    description: >-
+      An agent (person, organization, or system) responsible for making
+      an assertion about a heritage entity.
+      
+      **PROV-O ALIGNMENT**:
+      
+      Maps to `prov:Agent` - "An agent is something that bears some form
+      of responsibility for an activity taking place, for the existence
+      of an entity, or for another agent's activity."
+      
+      **TYPES OF ASSERTERS**:
+      
+      | Type | Description | Example |
+      |------|-------------|---------|
+      | HUMAN_ANALYST | Expert making judgment | "jane.doe@nde.nl" |
+      | AUTOMATED_SYSTEM | Software system | "primary-presence-classifier/1.0" |
+      | AI_AGENT | AI/ML model | "claude-opus-4", "opencode-claude-sonnet-4" |
+      | ORGANIZATION | Institution | "Noord-Hollands Archief" |
+      
+      **USE CASES**:
+      
+      1. **Attribution Tracking**: Who made this assertion about primary presence?
+      2. **Provenance Chain**: Trace assertions back to their source agent.
+      3. **Quality Assessment**: Different asserters may have different reliability.
+      4. **Accountability**: Identify responsible party for each assertion.
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      Asserter:
+        asserter_id: https://nde.nl/ontology/hc/asserter/claude-opus-4
+        asserter_name: Claude Opus 4
+        asserter_type: AI_AGENT
+        asserter_description: Anthropic Claude AI model used for assertion generation
+        asserter_version: "claude-opus-4-20250514"
+      ```
+    exact_mappings:
+      - prov:Agent
+    close_mappings:
+      - foaf:Agent
+      - dcterms:Agent
+    related_mappings:
+      - schema:Person
+      - schema:Organization
+    slots:
+      - has_or_had_identifier
+      - has_or_had_label
+      - has_or_had_description
+      - asserter_type
+      - asserter_version
+      - asserter_contact
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      has_or_had_identifier:
+        range: uriorcurie
+        required: true
+        identifier: true
+        description: >-
+          Unique identifier for this asserter.
+        examples:
+          - value: https://nde.nl/ontology/hc/asserter/claude-opus-4
+            description: AI agent asserter
+          - value: https://nde.nl/ontology/hc/asserter/jane-doe-nde
+            description: Human analyst asserter
+      has_or_had_label:
+        range: string
+        required: true
+        description: >-
+          Name of the asserter.
+        examples:
+          - value: Claude Opus 4
+            description: AI model name
+          - value: Dr. Jane Doe
+            description: Human analyst name
+          - value: primary-presence-classifier
+            description: Automated system name
+      has_or_had_description:
+        range: string
+        required: false
+        description: >-
+          Description of the asserter and their role in the assertion process.
+        examples:
+          - value: Anthropic Claude AI model used for heritage data assertions
+          - value: Senior digital heritage analyst at NDE
+      asserter_type:
+        range: AsserterTypeEnum
+        required: true
+        description: >-
+          The type of agent making the assertion.
+        examples:
+          - value: AI_AGENT
+          - value: HUMAN_ANALYST
+          - value: AUTOMATED_SYSTEM
+      asserter_version:
+        range: string
+        required: false
+        description: >-
+          Version identifier for software agents.
+        examples:
+          - value: "claude-opus-4-20250514"
+          - value: "1.2.3"
+      asserter_contact:
+        range: string
+        required: false
+        description: >-
+          Contact information for human or organizational asserters.
+        examples:
+          - value: jane.doe@nde.nl
+          - value: heritage-team@museum.nl
+    comments:
+      - Asserter models the agent responsible for making assertions
+      - Supports tracking of human, automated, and AI-based assertions
+      - Uses PROV-O Agent as primary ontology mapping
+      - Version tracking particularly important for AI/ML agents
+    see_also:
+      - https://www.w3.org/TR/prov-o/#Agent
+      - https://xmlns.com/foaf/spec/#term_Agent
+    examples:
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/asserter/claude-opus-4
+          has_or_had_label: Claude Opus 4
+          asserter_type: AI_AGENT
+          has_or_had_description: Anthropic Claude AI model used for heritage data assertions
+          asserter_version: "claude-opus-4-20250514"
+        description: AI agent asserter
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/asserter/jane-doe-nde
+          has_or_had_label: Dr. Jane Doe
+          asserter_type: HUMAN_ANALYST
+          has_or_had_description: Senior digital heritage analyst at NDE
+          asserter_contact: jane.doe@nde.nl
+        description: Human analyst asserter
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/asserter/primary-presence-classifier
+          has_or_had_label: primary-presence-classifier
+          asserter_type: AUTOMATED_SYSTEM
+          has_or_had_description: Automated system for classifying primary digital presence
+          asserter_version: "1.0.0"
+        description: Automated system asserter
+slots:
+  asserter_type:
+    description: >-
+      The type of agent making the assertion (human, automated, AI, organization).
+    range: AsserterTypeEnum
+    slot_uri: hc:asserterType
+  asserter_version:
+    description: >-
+      Version identifier for software agents (automated systems or AI).
+    range: string
+    slot_uri: hc:asserterVersion
+  asserter_contact:
+    description: >-
+      Contact information for human or organizational asserters.
+    range: string
+    slot_uri: hc:asserterContact
--- a/frontend/public/schemas/20251121/linkml/modules/classes/Author.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/Author.yaml
@ -0,0 +1,199 @@
+id: https://nde.nl/ontology/hc/class/Author
+name: author_class
+title: Author Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+  bf: http://id.loc.gov/ontologies/bibframe/
+  bibo: http://purl.org/ontology/bibo/
+  foaf: http://xmlns.com/foaf/0.1/
+  rico: https://www.ica.org/standards/RiC/ontology#
+imports:
+- linkml:types
+- ../metadata
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/has_or_had_identifier
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+default_prefix: hc
+classes:
+  Author:
+    class_uri: schema:Person
+    description: >-
+      Person or organization that authored/created a creative work.
+      
+      **PURPOSE**:
+      
+      Author models the creator(s) of works produced by heritage custodians,
+      such as exhibition catalogs, research publications, finding aids, and
+      reports. Replaces simple string author lists with structured data.
+      
+      **ONTOLOGY ALIGNMENT**:
+      
+      | Ontology | Class/Property | Usage |
+      |----------|----------------|-------|
+      | **Schema.org** | `schema:Person`, `schema:author` | Primary class and property |
+      | **Dublin Core** | `dcterms:creator` | Creator relationship |
+      | **BIBFRAME** | `bf:Contribution`, `bf:Agent` | Bibliographic contributions |
+      | **FOAF** | `foaf:Person`, `foaf:name` | Personal information |
+      | **RiC-O** | `rico:Agent` | Archival agent modeling |
+      
+      **AUTHOR TYPES**:
+      
+      Authors may be:
+      - **Individual persons**: Named authors with affiliations
+      - **Organizations**: Corporate authors (e.g., "Rijksmuseum Staff")
+      - **Anonymous**: Works with unknown authorship
+      - **Collective**: Group authorships
+      
+      **ROLES**:
+      
+      Beyond simple "author", works may have multiple contributor types:
+      - Author (primary creator)
+      - Editor
+      - Compiler
+      - Translator
+      - Illustrator
+      - Contributor
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      has_or_had_author:
+        - author_name: "Jan de Vries"
+          author_role: AUTHOR
+          author_affiliation: "Rijksmuseum Amsterdam"
+        - author_name: "Maria van Dijk"
+          author_role: EDITOR
+      ```
+    exact_mappings:
+      - schema:Person
+      - foaf:Person
+    close_mappings:
+      - bf:Agent
+      - rico:Agent
+    related_mappings:
+      - bf:Contribution
+      - dcterms:creator
+    slots:
+      - author_name
+      - author_role
+      - author_affiliation
+      - author_identifier
+      - has_or_had_identifier
+      - has_or_had_label
+      - has_or_had_description
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      author_name:
+        range: string
+        required: true
+        description: >-
+          Full name of the author (person or organization).
+        examples:
+          - value: "Jan de Vries"
+            description: Individual author
+          - value: "Rijksmuseum Research Department"
+            description: Corporate author
+      author_role:
+        range: AuthorRoleEnum
+        required: false
+        ifabsent: "string(AUTHOR)"
+        description: >-
+          Role of this person in creating the work.
+        examples:
+          - value: AUTHOR
+            description: Primary author
+          - value: EDITOR
+            description: Editor
+      author_affiliation:
+        range: string
+        required: false
+        description: >-
+          Organization the author is affiliated with.
+        examples:
+          - value: "Rijksmuseum Amsterdam"
+            description: Museum affiliation
+          - value: "Universiteit van Amsterdam"
+            description: University affiliation
+      author_identifier:
+        range: uriorcurie
+        required: false
+        description: >-
+          Identifier for the author (ORCID, VIAF, etc.).
+        examples:
+          - value: "https://orcid.org/0000-0001-2345-6789"
+            description: ORCID identifier
+          - value: "https://viaf.org/viaf/12345678"
+            description: VIAF identifier
+    comments:
+      - Author replaces simple string author lists with structured data
+      - Supports both individual and organizational authors
+      - Includes roles (author, editor, compiler, etc.)
+      - Can link to identifier systems (ORCID, VIAF)
+    see_also:
+      - https://schema.org/author
+      - https://schema.org/Person
+      - http://id.loc.gov/ontologies/bibframe/Contribution
+    examples:
+      - value:
+          author_name: "Jan de Vries"
+          author_role: AUTHOR
+          author_affiliation: "Rijksmuseum Amsterdam"
+          author_identifier: "https://orcid.org/0000-0001-2345-6789"
+        description: Individual author with full metadata
+      - value:
+          author_name: "Maria van Dijk"
+          author_role: EDITOR
+        description: Editor with minimal metadata
+      - value:
+          author_name: "Rijksmuseum Research Department"
+          author_role: AUTHOR
+        description: Corporate author
+    annotations:
+      specificity_score: 0.35
+      specificity_rationale: >-
+        Authorship is broadly useful for creative/documentary works.
+
+slots:
+  author_name:
+    description: Full name of the author (person or organization).
+    range: string
+    slot_uri: schema:name
+  author_role:
+    description: Role of this person in creating the work.
+    range: string
+    slot_uri: hc:authorRole
+  author_affiliation:
+    description: Organization the author is affiliated with.
+    range: string
+    slot_uri: schema:affiliation
+  author_identifier:
+    description: Identifier for the author (ORCID, VIAF, etc.).
+    range: uriorcurie
+    slot_uri: schema:identifier
+
+enums:
+  AuthorRoleEnum:
+    description: Roles for contributors to a creative work.
+    permissible_values:
+      AUTHOR:
+        description: Primary creator of the work
+      EDITOR:
+        description: Person who edited the work
+      COMPILER:
+        description: Person who compiled/assembled the work
+      TRANSLATOR:
+        description: Person who translated the work
+      ILLUSTRATOR:
+        description: Person who created illustrations
+      CONTRIBUTOR:
+        description: General contributor
+      PHOTOGRAPHER:
+        description: Person who created photographs
--- a/frontend/public/schemas/20251121/linkml/modules/classes/BirthDate.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/BirthDate.yaml
@ -0,0 +1,217 @@
+id: https://nde.nl/ontology/hc/class/BirthDate
+name: birth_date_class
+title: Birth Date Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  time: http://www.w3.org/2006/time#
+  pico: https://personsincontext.org/model#
+  dcterms: http://purl.org/dc/terms/
+  xsd: http://www.w3.org/2001/XMLSchema#
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  BirthDate:
+    class_uri: schema:Date
+    description: >-
+      Structured representation of a person's birth date with support for
+      uncertainty, incomplete dates, and provenance tracking.
+      
+      **PURPOSE**:
+      
+      BirthDate replaces simple string birth_date slots to provide:
+      - EDTF (Extended Date/Time Format) support for uncertain/incomplete dates
+      - Provenance tracking for inferred dates (Rule 45)
+      - Confidence scoring
+      - Source preservation (original format from documents)
+      
+      **EDTF NOTATION** (Rule 44):
+      
+      | Pattern | Meaning | Example |
+      |---------|---------|---------|
+      | `YYYY` | Year only | `1970` |
+      | `YYYY-MM` | Year and month | `1970-08` |
+      | `YYYY-MM-DD` | Full date | `1970-08-15` |
+      | `YYYX` | Decade | `197X` (1970s) |
+      | `YYXX` | Century | `19XX` (1900s) |
+      | `YYYY~` | Approximate | `1985~` (circa 1985) |
+      | `YYYY?` | Uncertain | `1985?` (possibly 1985) |
+      | `XXXX` | Unknown | Must have search provenance |
+      
+      **INFERRED DATA** (Rule 45):
+      
+      When birth date is inferred (e.g., from earliest education date):
+      - Store in `inferred_birth_date` with full inference chain
+      - Set `is_inferred: true`
+      - Document inference method and sources
+      
+      **ONTOLOGY ALIGNMENT**:
+      
+      | Ontology | Mapping | Usage |
+      |----------|---------|-------|
+      | **Schema.org** | `schema:Date` | Primary class |
+      | **CIDOC-CRM** | `crm:E52_Time-Span` | Temporal extent |
+      | **PiCo** | Birth date observation | Source fidelity |
+      | **TIME** | `time:Instant` | Point in time |
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      has_or_had_date_of_birth:
+        birth_edtf: "1970-08-15"
+        birth_iso_date: "1970-08-15"
+        is_inferred: false
+        confidence: high
+      ```
+    exact_mappings:
+      - schema:Date
+    close_mappings:
+      - crm:E52_Time-Span
+      - time:Instant
+    related_mappings:
+      - pico:PersonObservation
+    slots:
+      - birth_edtf
+      - birth_iso_date
+      - birth_source_text
+      - is_inferred
+      - inference_provenance
+      - confidence
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      birth_edtf:
+        range: string
+        required: true
+        description: >-
+          Birth date in EDTF notation (Extended Date/Time Format).
+          Supports incomplete dates, uncertainty, and approximation.
+        examples:
+          - value: "1970-08-15"
+            description: Full date known
+          - value: "1970-08"
+            description: Year and month known
+          - value: "1970"
+            description: Only year known
+          - value: "197X"
+            description: Decade known (1970s)
+          - value: "1970~"
+            description: Approximate (circa 1970)
+          - value: "XXXX"
+            description: Unknown (requires search provenance)
+      birth_iso_date:
+        range: date
+        required: false
+        description: >-
+          Birth date as ISO 8601 date (YYYY-MM-DD) when full date is known.
+          Optional - use birth_edtf for partial/uncertain dates.
+        examples:
+          - value: "1970-08-15"
+      birth_source_text:
+        range: string
+        required: false
+        description: >-
+          Original date text from source document, preserved verbatim.
+          Useful for archival/historical sources with non-standard notation.
+        examples:
+          - value: "born in the year of our Lord 1823"
+          - value: "ca. 1750"
+          - value: "late 18th century"
+      is_inferred:
+        range: boolean
+        required: false
+        ifabsent: "false"
+        description: >-
+          Whether this birth date was inferred (vs. directly extracted).
+          If true, inference_provenance MUST be provided per Rule 45.
+      inference_provenance:
+        range: string
+        required: false
+        description: >-
+          JSON string documenting inference chain per Rule 45.
+          Required when is_inferred is true.
+        examples:
+          - value: '{"method": "earliest_education_heuristic", "inference_chain": [...]}'
+      confidence:
+        range: BirthDateConfidenceEnum
+        required: false
+        description: >-
+          Confidence level in the birth date value.
+    comments:
+      - "Replaces simple birth_date string slot (Rule 53)"
+      - "EDTF notation enables uncertain/incomplete date representation"
+      - "Inference provenance required when is_inferred=true (Rule 45)"
+      - "Source text preservation supports archival/historical research"
+    see_also:
+      - https://www.loc.gov/standards/datetime/
+      - https://schema.org/birthDate
+    examples:
+      - value:
+          birth_edtf: "1970-08-15"
+          birth_iso_date: "1970-08-15"
+          is_inferred: false
+          confidence: HIGH
+        description: Full date known with high confidence
+      - value:
+          birth_edtf: "197X"
+          is_inferred: true
+          inference_provenance: '{"method": "earliest_education_heuristic", "source_field": "education[0].start_year"}'
+          confidence: LOW
+        description: Decade inferred from education start year
+      - value:
+          birth_edtf: "1823"
+          birth_source_text: "born in the year of our Lord 1823"
+          is_inferred: false
+          confidence: MEDIUM
+        description: Year extracted from historical document
+    annotations:
+      specificity_score: 0.45
+      specificity_rationale: >-
+        Birth dates are relevant for person research across all heritage sectors.
+
+slots:
+  birth_edtf:
+    description: Birth date in EDTF notation.
+    range: string
+    slot_uri: dcterms:date
+  birth_iso_date:
+    description: Birth date as ISO 8601 date when full date is known.
+    range: date
+    slot_uri: schema:birthDate
+  birth_source_text:
+    description: Original date text from source document.
+    range: string
+    slot_uri: hc:sourceText
+  is_inferred:
+    description: Whether this date was inferred.
+    range: boolean
+    slot_uri: hc:isInferred
+  inference_provenance:
+    description: JSON documenting inference chain.
+    range: string
+    slot_uri: hc:inferenceProvenance
+  confidence:
+    description: Confidence level in the date value.
+    range: string
+    slot_uri: hc:confidence
+
+enums:
+  BirthDateConfidenceEnum:
+    description: Confidence levels for birth date values.
+    permissible_values:
+      HIGH:
+        description: Full date from authoritative source (e.g., birth certificate)
+      MEDIUM:
+        description: Date from reliable source (e.g., official biography)
+      LOW:
+        description: Date inferred or from uncertain source
+      VERY_LOW:
+        description: Decade/century estimated from indirect evidence
--- a/frontend/public/schemas/20251121/linkml/modules/classes/BirthPlace.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/BirthPlace.yaml
@ -0,0 +1,223 @@
+id: https://nde.nl/ontology/hc/class/BirthPlace
+name: birth_place_class
+title: Birth Place Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  gn: http://www.geonames.org/ontology#
+  wdt: http://www.wikidata.org/prop/direct/
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  BirthPlace:
+    class_uri: schema:Place
+    description: >-
+      Structured representation of a person's place of birth with support
+      for historical place names, modern equivalents, and geographic identifiers.
+      
+      **PURPOSE**:
+      
+      BirthPlace replaces simple string birth_place slots to provide:
+      - Historical place name preservation
+      - Modern place name linkage
+      - Geographic identifier integration (GeoNames, Wikidata)
+      - Coordinate storage for mapping applications
+      
+      **HISTORICAL VS. MODERN NAMES**:
+      
+      Many birth places used historical names that have since changed:
+      - "Batavia" → "Jakarta"
+      - "Bombay" → "Mumbai"
+      - "Leningrad" → "St. Petersburg"
+      - "Saigon" → "Ho Chi Minh City"
+      
+      BirthPlace preserves the source name while linking to modern identifiers.
+      
+      **GEOGRAPHIC RESOLUTION**:
+      
+      Per AGENTS.md Rule on GeoNames as authoritative source:
+      - `geonames_id`: Links to GeoNames for standardization
+      - `wikidata_id`: Links to Wikidata for additional context
+      - `coordinates`: Lat/lon for mapping
+      
+      **ONTOLOGY ALIGNMENT**:
+      
+      | Ontology | Mapping | Usage |
+      |----------|---------|-------|
+      | **Schema.org** | `schema:Place` | Primary class |
+      | **CIDOC-CRM** | `crm:E53_Place` | Place entity |
+      | **GeoNames** | `gn:Feature` | Geographic feature |
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      has_or_had_place_of_birth:
+        place_name: "Batavia"
+        modern_place_name: "Jakarta"
+        country_code: "ID"
+        geonames_id: 1642911
+        wikidata_id: "Q3630"
+      ```
+    exact_mappings:
+      - schema:Place
+    close_mappings:
+      - crm:E53_Place
+      - gn:Feature
+    slots:
+      - place_name
+      - modern_place_name
+      - country_code
+      - region_code
+      - geonames_id
+      - wikidata_id
+      - coordinates
+      - place_source_text
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      place_name:
+        range: string
+        required: true
+        description: >-
+          Name of the birth place as recorded in source.
+          May be historical name that has since changed.
+        examples:
+          - value: "Amsterdam"
+            description: Current name
+          - value: "Batavia"
+            description: Historical name (now Jakarta)
+      modern_place_name:
+        range: string
+        required: false
+        description: >-
+          Modern equivalent name if place_name is historical.
+          Leave null if place_name is current.
+        examples:
+          - value: "Jakarta"
+            description: Modern name for Batavia
+      country_code:
+        range: string
+        required: false
+        pattern: "^[A-Z]{2}$"
+        description: >-
+          ISO 3166-1 alpha-2 country code.
+        examples:
+          - value: "NL"
+          - value: "ID"
+      region_code:
+        range: string
+        required: false
+        description: >-
+          ISO 3166-2 region/province code or GeoNames admin1 code.
+        examples:
+          - value: "NH"
+            description: Noord-Holland
+      geonames_id:
+        range: integer
+        required: false
+        description: >-
+          GeoNames geographic identifier for the place.
+          Authoritative source per AGENTS.md.
+        examples:
+          - value: 2759794
+            description: Amsterdam GeoNames ID
+      wikidata_id:
+        range: string
+        required: false
+        pattern: "^Q[0-9]+$"
+        description: >-
+          Wikidata entity identifier for the place.
+        examples:
+          - value: "Q727"
+            description: Amsterdam Wikidata ID
+      coordinates:
+        range: string
+        required: false
+        description: >-
+          Geographic coordinates as "lat,lon" string.
+        examples:
+          - value: "52.3676,4.9041"
+            description: Amsterdam coordinates
+      place_source_text:
+        range: string
+        required: false
+        description: >-
+          Original place text from source document, preserved verbatim.
+          Useful when source contains additional context.
+        examples:
+          - value: "born at the family estate in rural Gelderland"
+    comments:
+      - "Replaces simple birth_place string slot (Rule 53)"
+      - "Preserves historical place names while linking to modern identifiers"
+      - "GeoNames ID is authoritative per AGENTS.md"
+    see_also:
+      - https://schema.org/birthPlace
+      - https://www.geonames.org/
+    examples:
+      - value:
+          place_name: "Amsterdam"
+          country_code: "NL"
+          region_code: "NH"
+          geonames_id: 2759794
+          wikidata_id: "Q727"
+          coordinates: "52.3676,4.9041"
+        description: Birth place with full geographic resolution
+      - value:
+          place_name: "Batavia"
+          modern_place_name: "Jakarta"
+          country_code: "ID"
+          geonames_id: 1642911
+          wikidata_id: "Q3630"
+        description: Historical place name with modern equivalent
+      - value:
+          place_name: "rural Gelderland"
+          country_code: "NL"
+          region_code: "GE"
+          place_source_text: "born at the family estate in rural Gelderland"
+        description: Imprecise location from archival source
+    annotations:
+      specificity_score: 0.45
+      specificity_rationale: >-
+        Birth places are relevant for person research across heritage sectors.
+
+slots:
+  place_name:
+    description: Name of the place as recorded in source.
+    range: string
+    slot_uri: schema:name
+  modern_place_name:
+    description: Modern equivalent name if different from source name.
+    range: string
+    slot_uri: hc:modernPlaceName
+  country_code:
+    description: ISO 3166-1 alpha-2 country code.
+    range: string
+    slot_uri: schema:addressCountry
+  region_code:
+    description: ISO 3166-2 region/province code.
+    range: string
+    slot_uri: schema:addressRegion
+  geonames_id:
+    description: GeoNames geographic identifier.
+    range: integer
+    slot_uri: gn:geonamesId
+  wikidata_id:
+    description: Wikidata entity identifier.
+    range: string
+    slot_uri: wdt:P625
+  coordinates:
+    description: Geographic coordinates as lat,lon string.
+    range: string
+    slot_uri: schema:geo
+  place_source_text:
+    description: Original place text from source document.
+    range: string
+    slot_uri: hc:sourceText
--- a/frontend/public/schemas/20251121/linkml/modules/classes/BranchOffice.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/BranchOffice.yaml
@ -9,8 +9,15 @@ imports:
 - ../slots/has_or_had_description
 - ../slots/has_or_had_identifier
 - ../slots/has_or_had_label
- ../slots/branch_service_area
- ../slots/branch_staff_count
+# REMOVED - migrated to has_or_had_service_area (Rule 53)
+# - ../slots/branch_service_area
+- ../slots/has_or_had_service_area
+- ./ServiceArea
+# REMOVED - migrated to has_or_had_quantity (Rule 53)
+# - ../slots/branch_staff_count
+- ../slots/has_or_had_quantity
+- ./Quantity
+- ../enums/QuantityTypeEnum
 - ../slots/has_local_collection
 - ../slots/is_public_facing
 - ../slots/operating_hour
@ -69,8 +76,12 @@ classes:
    - has_or_had_description
    - has_or_had_identifier
    - has_or_had_label
-    - branch_service_area
-    - branch_staff_count
+    # REMOVED - migrated to has_or_had_service_area (Rule 53)
+    # - branch_service_area
+    - has_or_had_service_area
+    # REMOVED - migrated to has_or_had_quantity (Rule 53)
+    # - branch_staff_count
+    - has_or_had_quantity
    - has_local_collection
    - is_public_facing
    - operating_hour
@ -115,13 +126,27 @@ classes:
        - value: Regional branch serving Zaanstreek-Waterland area. Holds municipal records from Zaandam, Wormerland, Purmerend.
            Open to researchers Tuesday-Thursday.
          description: Archive branch description
-      branch_service_area:
-        range: string
+      # REMOVED - migrated to has_or_had_service_area (Rule 53)
+      # branch_service_area:
+      #   range: string
+      #   examples:
+      #   - value: Zaanstreek-Waterland region
+      #     description: Regional coverage
+      #   - value: Amsterdam Schiphol Airport travelers
+      #     description: Specific community served
+      has_or_had_service_area:
+        range: ServiceArea
+        inlined: true
+        description: >-
+          Geographic area or community served by this branch.
+          MIGRATED from branch_service_area (Rule 53) - changed from string to
+          ServiceArea class for richer geographic modeling.
        examples:
-        - value: Zaanstreek-Waterland region
-          description: Regional coverage
-        - value: Amsterdam Schiphol Airport travelers
-          description: Specific community served
+        - value:
+            service_area_id: https://nde.nl/ontology/hc/servicearea/zaanstreek-waterland
+            service_area_name: Zaanstreek-Waterland region
+            service_area_type: REGIONAL
+          description: Regional coverage as structured ServiceArea
      is_public_facing:
        range: boolean
        required: true
@ -144,11 +169,28 @@ classes:
        examples:
        - value: Tu-Th 09:00-17:00
          description: Limited weekday hours
-      branch_staff_count:
-        range: integer
+      # REMOVED - migrated to has_or_had_quantity (Rule 53)
+      # branch_staff_count:
+      #   range: integer
+      #   examples:
+      #   - value: 3
+      #     description: Small branch staff
+      has_or_had_quantity:
+        range: Quantity
+        inlined: true
+        description: >-
+          Quantified values associated with this branch office (e.g., staff count).
+          MIGRATED from branch_staff_count (Rule 53) - changed from integer to
+          Quantity class for richer measurement context (units, dates, estimates).
        examples:
-        - value: 3
-          description: Small branch staff
+        - value:
+            quantity_value: 3
+            quantity_type: STAFF_COUNT
+            quantity_unit: FTE
+            has_or_had_description: Staff assigned to this branch
+            quantity_date: '2025-01-01'
+            is_estimate: false
+          description: Branch staff count as structured Quantity
      has_local_collection:
        range: boolean
        examples:
@ -177,14 +219,21 @@ classes:
        has_or_had_label: Noord-Hollands Archief - Zaanstreek-Waterland
        has_or_had_description: Regional branch serving Zaanstreek-Waterland area. Holds municipal records from Zaandam,
          Wormerland, Purmerend.
-        branch_service_area: Zaanstreek-Waterland region
+        has_or_had_service_area:
+          service_area_id: https://nde.nl/ontology/hc/servicearea/zaanstreek-waterland
+          service_area_name: Zaanstreek-Waterland region
+          service_area_type: REGIONAL
        is_public_facing: true
        services_offered:
        - Archival research access
        - Genealogical consultations
        - Local history reference
        operating_hours: Tu-Th 09:00-17:00
-        branch_staff_count: 3
+        has_or_had_quantity:
+          quantity_value: 3
+          quantity_type: STAFF_COUNT
+          quantity_unit: FTE
+          has_or_had_description: Staff assigned to Zaanstreek-Waterland branch
        has_local_collection: true
      description: Regional archive branch
    - value:
@ -192,12 +241,19 @@ classes:
        has_or_had_label: Rijksmuseum Schiphol
        has_or_had_description: Exhibition space at Schiphol Airport featuring rotating highlights from the Rijksmuseum
          collection. Free admission.
-        branch_service_area: Amsterdam Schiphol Airport travelers
+        has_or_had_service_area:
+          service_area_id: https://nde.nl/ontology/hc/servicearea/schiphol-travelers
+          service_area_name: Amsterdam Schiphol Airport travelers
+          service_area_type: COMMUNITY
        is_public_facing: true
        services_offered:
        - Exhibition viewing
        - Museum shop
        operating_hours: Daily 07:00-20:00
-        branch_staff_count: 5
+        has_or_had_quantity:
+          quantity_value: 5
+          quantity_type: STAFF_COUNT
+          quantity_unit: FTE
+          has_or_had_description: Staff assigned to Schiphol branch
        has_local_collection: false
      description: Museum airport branch
--- a/frontend/public/schemas/20251121/linkml/modules/classes/Budget.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/Budget.yaml
@ -250,9 +250,12 @@ classes:
      has_approval_date:
        range: date
        required: false
-      is_or_was_is_or_was_approved_by:  # MIGRATED: was was_approved_by (2026-01-15)
-        description: Agent (person/organization) that approved this budget
-        range: string
+      is_or_was_approved_by:
+        description: >-
+          Agent (person/organization) that approved this budget.
+          MIGRATED from approved_by (2026-01-15) per Rule 39.
+          Range changed from string to Approver class for structured approval tracking.
+        range: Approver
        required: false
      # MIGRATED from budget_status to has_or_had_status (Rule 53)
      # budget_status:
@ -336,7 +339,8 @@ classes:
        internal_funding: 25000000.0
        endowment_draw: 5000000.0
        approval_date: '2023-11-15'
-        is_or_was_approved_by: Board of Directors
+        is_or_was_approved_by:
+          approver_name: Board of Directors
        has_or_had_status:
          value: ACTIVE
          effective_date: '2024-01-01'
@ -360,7 +364,8 @@ classes:
        external_funding: 6000000.0
        internal_funding: 2500000.0
        approval_date: '2024-03-01'
-        is_or_was_approved_by: Province of Noord-Holland
+        is_or_was_approved_by:
+          approver_name: Province of Noord-Holland
        has_or_had_status:
          value: ACTIVE
          effective_date: '2024-04-01'
--- a/frontend/public/schemas/20251121/linkml/modules/classes/CustodianPlace.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/CustodianPlace.yaml
@ -14,7 +14,9 @@ imports:
 - ./GeoSpatialPlace
 - ../enums/PlaceSpecificityEnum
 - ./ReconstructedEntity
- ../slots/auxiliary_places
+# REMOVED - migrated to has_or_had_auxiliary_entities with range AuxiliaryPlace (Rule 53)
+# - ../slots/auxiliary_places
+- ../slots/has_or_had_auxiliary_entities
 - ../slots/place_name
 - ../slots/place_language
 - ../slots/place_specificity
@ -65,7 +67,9 @@ classes:
    - prov:Entity
    - crm:E27_Site
    slots:
-    - auxiliary_places
+    # MIGRATED from auxiliary_places to has_or_had_auxiliary_entities (Rule 53)
+    # - auxiliary_places
+    - has_or_had_auxiliary_entities
    - country
    - has_feature_type
    - has_geospatial_location
@ -171,7 +175,11 @@ classes:
            has_accuracy_in_meters: 50.0
            spatial_resolution: NEIGHBORHOOD
          description: Approximate location from neighborhood reference
-      has_auxiliary_place:
+      # MIGRATED from auxiliary_places / has_auxiliary_place (Rule 53)
+      has_or_had_auxiliary_entities:
+        description: |
+          MIGRATED from auxiliary_places (Rule 53).
+          Subordinate or auxiliary locations associated with this custodian place.
        range: AuxiliaryPlace
        multivalued: true
        inlined_as_list: true
@ -211,7 +219,7 @@ classes:
    - Link to GeoSpatialPlace via has_geospatial_location slot (TOOI pattern)
    - Can be vague ('the mansion') or specific ('het museum op het Museumplein 1')
    - Historical place names capture how custodians were referenced in archival documents
-    - 'NEW: auxiliary_places links to subordinate AuxiliaryPlace sites (depots, branches, labs)'
+    - 'MIGRATED: auxiliary_places → has_or_had_auxiliary_entities for AuxiliaryPlace sites (depots, branches, labs)'
    - Hierarchical pattern mirrors CustodianName → CustodianAppellation relationship
    see_also:
    - http://www.cidoc-crm.org/html/cidoc_crm_v7.1.3.html#E53
--- a/frontend/public/schemas/20251121/linkml/modules/classes/CustodianTimelineEvent.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/CustodianTimelineEvent.yaml
@ -18,7 +18,10 @@ imports:
 - ../enums/DataTierEnum
 - ../enums/DatePrecisionEnum
 - ../enums/TimelineExtractionMethodEnum
- ../slots/approximate
+# REMOVED - migrated to is_or_was_approximate (Rule 53)
+# - ../slots/approximate
+- ../slots/is_or_was_approximate
+- ./ApproximationStatus
 - ../slots/has_archive_path
 - ../slots/data_tier
 - ../slots/date_precision
@ -53,8 +56,8 @@ classes:
      \ Scope decrease (ingekrompen)\n- REORGANIZATION: Complex restructuring (herstructurering)\n\n**EXCLUDED EVENT TYPES**\n\
      \nSome patterns are NOT mapped to events:\n- predecessor: This is a relationship, not an event\n- friends_org: Separate\
      \ organization (Vrienden van...)\n- reopening: Not in OrganizationalChangeEventTypeEnum\n\n**EXAMPLE USAGE**\n\n```yaml\n\
-      timeline_events:\n  - event_type: FOUNDING\n    event_date: \"2005-04-30\"\n    date_precision: day\n    approximate:\
-      \ false\n    description: >-\n      Het RHC Drents Archief werd opgericht op 30 april 2005.\n      Het is de voortzetting\
+      timeline_events:\n  - event_type: FOUNDING\n    event_date: \"2005-04-30\"\n    date_precision: day\n    is_or_was_approximate:\n\
+      \      approximation_level: EXACT\n    description: >-\n      Het RHC Drents Archief werd opgericht op 30 april 2005.\n      Het is de voortzetting\
      \ van het Rijksarchief in Drenthe (sinds 2000).\n    source_url:\n      - \"https://nl.wikipedia.org/wiki/Drents_Archief\"\
      \n      - \"https://bizzy.ai/nl/nl/52454037/regionaal-historisch-centrum-rhc-drents-archief\"\n    extraction_method:\
      \ api_response_regex\n    extraction_timestamp: \"2025-12-16T10:00:00Z\"\n    extraction_notes: >-\n      Query: \"\
@ -67,7 +70,9 @@ classes:
    - tooi:Wijzigingsgebeurtenis
    - schema:Event
    slots:
-    - approximate
+    # REMOVED - migrated to is_or_was_approximate (Rule 53)
+    # - approximate
+    - is_or_was_approximate
    - archive_path
    - data_tier
    - date_precision
@ -88,8 +93,26 @@ classes:
        required: false
      date_precision:
        required: true
-      is_approximate:
+      # REMOVED - migrated to is_or_was_approximate (Rule 53)
+      # is_approximate:
+      #   required: true
+      is_or_was_approximate:
+        range: ApproximationStatus
+        inlined: true
        required: true
+        description: >-
+          Whether the event date is approximate or uncertain.
+          MIGRATED from approximate (Rule 53) - changed from boolean to
+          ApproximationStatus class for structured uncertainty modeling.
+        examples:
+          - value:
+              approximation_level: EXACT
+            description: Exact date known
+          - value:
+              approximation_level: APPROXIMATE
+              has_or_had_label: "circa 1880"
+              has_or_had_description: "Founding date known only to year"
+            description: Approximate date with explanation
      description:
        required: true
      source_url:
@ -134,7 +157,8 @@ classes:
        event_type: FOUNDING
        event_date: '2005-04-30'
        date_precision: day
-        approximate: false
+        is_or_was_approximate:
+          approximation_level: EXACT
        description: Het RHC Drents Archief werd opgericht op 30 april 2005.
        source_url:
        - https://nl.wikipedia.org/wiki/Drents_Archief
@ -148,7 +172,8 @@ classes:
        event_type: MERGER
        event_date: '2005'
        date_precision: year
-        approximate: false
+        is_or_was_approximate:
+          approximation_level: EXACT
        description: In 2005 ging het Gemeentearchief Assen op in het Drents Archief.
        source_url:
        - https://nl.wikipedia.org/wiki/Drents_Archief
@ -160,7 +185,8 @@ classes:
        event_type: FOUNDING
        event_date: '1810'
        date_precision: year
-        approximate: false
+        is_or_was_approximate:
+          approximation_level: EXACT
        description: The Rijksmuseum was founded in 1810 as the Royal Museum.
        source_url:
        - https://www.wikidata.org/wiki/Q190804
@ -173,7 +199,8 @@ classes:
        event_type: TRANSFER
        event_date: '1885'
        date_precision: year
-        approximate: false
+        is_or_was_approximate:
+          approximation_level: EXACT
        description: The Rijksmuseum moved to its current building designed by Cuypers.
        source_url:
        - https://www.rijksmuseum.nl/en/about-us/what-we-do/history
@ -183,3 +210,16 @@ classes:
        archive_path: web/0001/rijksmuseum.nl/about-us/rendered.html
        data_tier: TIER_2_VERIFIED
      description: Relocation event from institutional website
+    - value:
+        event_type: FOUNDING
+        event_date: '1880'
+        date_precision: year
+        is_or_was_approximate:
+          approximation_level: APPROXIMATE
+          has_or_had_label: "circa 1880"
+          has_or_had_description: "Founding date derived from secondary sources, exact year uncertain"
+        description: Museum founded around 1880, exact date unknown.
+        extraction_method: manual_research
+        extraction_timestamp: '2025-12-20T16:00:00Z'
+        data_tier: TIER_4_INFERRED
+      description: Founding event with approximate date
--- a/frontend/public/schemas/20251121/linkml/modules/classes/DigitalPlatform.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/DigitalPlatform.yaml
@ -16,7 +16,9 @@ imports:
 - ./SearchAPI
 - ./METSAPI
 - ./DataServiceEndpointTypes
- ../slots/auxiliary_platforms
+# REMOVED - migrated to has_or_had_auxiliary_entities with range AuxiliaryDigitalPlatform (Rule 53)
+# - ../slots/auxiliary_platforms
+- ../slots/has_or_had_auxiliary_entities
 - ../slots/has_or_had_powered_by_cm
 - ../slots/has_or_had_access_restriction
 - ../slots/preservation_level
@ -103,7 +105,9 @@ classes:
    slots:
    - has_or_had_access_restriction
    - has_or_had_api_endpoint
-    - auxiliary_platforms
+    # MIGRATED from auxiliary_platforms to has_or_had_auxiliary_entities (Rule 53)
+    # - auxiliary_platforms
+    - has_or_had_auxiliary_entities
    - collection_web_address
    - has_or_had_data_service_endpoint
    - fixity_check_date
@ -241,7 +245,11 @@ classes:
          description: Open to all users
        - value: API key required
          description: Developer registration needed
-      has_auxiliary_platform:
+      # MIGRATED from auxiliary_platforms / has_auxiliary_platform (Rule 53)
+      has_or_had_auxiliary_entities:
+        description: |
+          MIGRATED from auxiliary_platforms (Rule 53).
+          Subordinate or auxiliary digital platforms associated with this platform.
        range: AuxiliaryDigitalPlatform
        multivalued: true
        inlined_as_list: true
@ -326,7 +334,7 @@ classes:
    - 'Multivalued on Custodian: one custodian can have multiple platforms (website + API + mobile app)'
    - Temporal validity tracks platform lifecycle (launch, shutdown, migration)
    - IIIF and linked data flags enable discovery of interoperable platforms
-    - 'NEW: auxiliary_platforms links to subordinate AuxiliaryDigitalPlatform sites (project portals, microsites, APIs)'
+    - 'MIGRATED: auxiliary_platforms → has_or_had_auxiliary_entities for AuxiliaryDigitalPlatform sites (project portals, microsites, APIs)'
    - Hierarchical pattern mirrors CustodianName → CustodianAppellation relationship
    see_also:
    - https://schema.org/WebSite
--- a/frontend/public/schemas/20251121/linkml/modules/classes/ExhibitionCatalog.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/ExhibitionCatalog.yaml
@ -20,7 +20,10 @@ imports:
 - ../slots/isbn
 - ../slots/language
 - ../slots/price
- ../slots/authors
+# REMOVED - migrated to has_or_had_author (Rule 53)
+# - ../slots/authors
+- ../slots/has_or_had_author
+- ./Author
 # REMOVED: ../slots/binding - Use has_or_had_type with BindingType instead (2026-01-15)
 - ../slots/has_or_had_type
 - ./BindingType
@ -51,7 +54,7 @@ imports:
 - ../slots/worldcat_id
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
- ../slots/has_author
+# REMOVED: ../slots/has_author - migrated to has_or_had_author (Rule 53)
 default_prefix: hc
 classes:
  ExhibitionCatalog:
@ -80,7 +83,8 @@ classes:
    - bf:Instance
    - bibo:Book
    slots:
-    - authors
+    # REMOVED: authors - migrated to has_or_had_author (Rule 53)
+    - has_or_had_author
    # REMOVED: binding - Use has_or_had_type with BindingType instead (2026-01-15)
    - has_or_had_type
    - catalog_description
@ -146,13 +150,28 @@ classes:
        examples:
        - value: PRINT_CATALOG
        - value: DIGITAL_CATALOG
-      has_author:
+      has_or_had_author:
+        description: >-
+          Authors of the exhibition catalog.
+          MIGRATED from authors/has_author slots (Rule 53).
+          
+          Uses Author class for structured authorship data including
+          name, role (author/editor/translator), affiliation, and identifiers.
        required: false
-        range: string
+        range: Author
+        inlined: true
        multivalued: true
        examples:
-        - value: Pieter Roelofs
-        - value: Gregor J.M. Weber
+        - value: |
+            author_name: Pieter Roelofs
+            author_role: AUTHOR
+            author_affiliation: Rijksmuseum Amsterdam
+          description: Primary author with affiliation
+        - value: |
+            author_name: Gregor J.M. Weber
+            author_role: AUTHOR
+            author_identifier: https://orcid.org/0000-0002-1234-5678
+          description: Author with ORCID identifier
      editor:
        required: false
        range: string
@ -340,9 +359,13 @@ classes:
        catalog_title: Vermeer
        catalog_for: https://nde.nl/ontology/hc/exhibition/rijksmuseum-vermeer-2023
        catalog_type: PRINT_CATALOG
-        has_author:
-        - Pieter Roelofs
-        - Gregor J.M. Weber
+        has_or_had_author:
+        - author_name: Pieter Roelofs
+          author_role: AUTHOR
+          author_affiliation: Rijksmuseum Amsterdam
+        - author_name: Gregor J.M. Weber
+          author_role: AUTHOR
+          author_affiliation: Rijksmuseum Amsterdam
        editor:
        - Pieter Roelofs
        publisher: Rijksmuseum / Hannibal Publishing
--- a/frontend/public/schemas/20251121/linkml/modules/classes/PersonObservation.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/PersonObservation.yaml
@ -17,8 +17,14 @@ imports:
 - ../slots/id
 - ../slots/person_name
 - ../slots/has_person_name
- ../slots/birth_date
- ../slots/birth_place
+# REMOVED - migrated to has_or_had_date_of_birth (Rule 53)
+# - ../slots/birth_date
+- ../slots/has_or_had_date_of_birth
+- ./BirthDate
+# REMOVED - migrated to has_or_had_place_of_birth (Rule 53)
+# - ../slots/birth_place
+- ../slots/has_or_had_place_of_birth
+- ./BirthPlace
 - ../slots/death_place
 - ../slots/date_of_death
 - ../slots/deceased
@ -99,8 +105,10 @@ classes:
    slots:
    - is_or_was_affected_by_event
    - has_age
-    - birth_date
-    - birth_place
+    # REMOVED: birth_date - migrated to has_or_had_date_of_birth (Rule 53)
+    - has_or_had_date_of_birth
+    # REMOVED: birth_place - migrated to has_or_had_place_of_birth (Rule 53)
+    - has_or_had_place_of_birth
    - contact_email
    - created
    - date_of_death
@ -148,12 +156,48 @@ classes:
        - Required is false initially to allow PersonObservation without hub linkage
        - Production data SHOULD always have this link for full PICO compliance
        - 'Inverse relationship: Person.has_person_observation (implemented v0.9.8)'
-      birth_date:
-        range: string
+      has_or_had_date_of_birth:
+        description: >-
+          Birth date of the person using structured BirthDate class.
+          MIGRATED from birth_date slot (Rule 53).
+          
+          Supports EDTF notation for uncertain/incomplete dates and
+          tracks provenance for inferred dates per Rule 45.
+        range: BirthDate
+        inlined: true
        required: false
-      birth_place:
-        range: string
+        examples:
+          - value: |
+              birth_edtf: "1970-08-15"
+              is_inferred: false
+              confidence: HIGH
+            description: Full date known
+          - value: |
+              birth_edtf: "197X"
+              is_inferred: true
+              confidence: LOW
+            description: Decade inferred from career start
+      has_or_had_place_of_birth:
+        description: >-
+          Birth place of the person using structured BirthPlace class.
+          MIGRATED from birth_place slot (Rule 53).
+          
+          Supports historical vs. modern place names and links to
+          GeoNames/Wikidata for geographic resolution.
+        range: BirthPlace
+        inlined: true
        required: false
+        examples:
+          - value: |
+              place_name: Amsterdam
+              country_code: NL
+              geonames_id: 2759794
+            description: Birth place with geographic identifiers
+          - value: |
+              place_name: Batavia
+              modern_place_name: Jakarta
+              country_code: ID
+            description: Historical place name
      death_place:
        range: string
        required: false
--- a/frontend/public/schemas/20251121/linkml/modules/classes/PrimaryDigitalPresenceAssertion.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/PrimaryDigitalPresenceAssertion.yaml
@ -10,7 +10,10 @@ imports:
 - ../slots/confidence_score
 - ../slots/superseded_by
 - ../slots/is_or_was_about_digital_presence
- ../slots/asserted_by
+# REMOVED - migrated to is_or_was_asserted_by (Rule 53)
+# - ../slots/asserted_by
+- ../slots/is_or_was_asserted_by
+- ./Asserter
 - ../slots/has_assertion_date
 - ../slots/has_or_had_identifier
 - ../slots/has_assertion_rationale
@ -91,7 +94,9 @@ classes:
    - prov:wasGeneratedBy
    slots:
    - is_or_was_about_digital_presence
-    - asserted_by
+    # REMOVED - migrated to is_or_was_asserted_by (Rule 53)
+    # - asserted_by
+    - is_or_was_asserted_by
    - has_assertion_date
    - has_or_had_identifier
    - has_assertion_rationale
@ -165,6 +170,27 @@ classes:
        required: false
        examples:
        - value: '2025-11-29T14:30:00Z'
+      is_or_was_asserted_by:
+        range: Asserter
+        inlined: true
+        required: false
+        description: >-
+          The agent responsible for making this assertion.
+          MIGRATED from asserted_by (Rule 53) - changed from string to Asserter
+          class for richer provenance tracking.
+        examples:
+        - value:
+            has_or_had_identifier: https://nde.nl/ontology/hc/asserter/primary-presence-analyzer
+            has_or_had_label: primary-presence-analyzer
+            asserter_type: AUTOMATED_SYSTEM
+            asserter_version: "1.0"
+          description: Automated system asserter
+        - value:
+            has_or_had_identifier: https://nde.nl/ontology/hc/asserter/jane-doe
+            has_or_had_label: Jane Doe
+            asserter_type: HUMAN_ANALYST
+            asserter_contact: jane.doe@heritage-org.nl
+          description: Human analyst asserter
      was_asserted_by:
        range: string
        required: false
--- a/frontend/public/schemas/20251121/linkml/modules/classes/Quantity.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/Quantity.yaml
@ -0,0 +1,223 @@
+id: https://nde.nl/ontology/hc/class/Quantity
+name: Quantity
+title: Quantity Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  qudt: http://qudt.org/schema/qudt/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+imports:
+- linkml:types
+- ../enums/QuantityTypeEnum
+- ../slots/has_or_had_identifier
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  Quantity:
+    class_uri: qudt:Quantity
+    description: >-
+      A quantified value with an optional unit of measurement and type.
+      
+      **QUDT ALIGNMENT**:
+      
+      Maps to `qudt:Quantity` - "A quantitative value expressed as a
+      number and a unit of measurement."
+      
+      **TYPES OF QUANTITIES**:
+      
+      | Type | Description | Example |
+      |------|-------------|---------|
+      | STAFF_COUNT | Number of employees | 42 employees |
+      | COLLECTION_SIZE | Number of items | 1.2 million objects |
+      | VISITOR_COUNT | Annual visitors | 2.5 million/year |
+      | BUDGET_AMOUNT | Financial value | €15 million |
+      | AREA | Physical space | 10,000 m² |
+      | DURATION | Time period | 6 months |
+      
+      **USE CASES**:
+      
+      1. **Staff Metrics**: Branch staff count, department size, FTE equivalents
+      2. **Collection Metrics**: Object counts, archive linear meters, digital items
+      3. **Visitor Metrics**: Annual attendance, daily capacity, peak visitors
+      4. **Financial Metrics**: Budget, revenue, acquisition costs
+      5. **Physical Metrics**: Floor area, gallery space, storage capacity
+      
+      **WHY NOT JUST USE INTEGER?**
+      
+      Simple integer fields like `branch_staff_count: 3` lose important context:
+      - What's the unit? (FTE? headcount? contractors included?)
+      - When was this measured? (provenance)
+      - Is this exact or estimated?
+      - What type of quantity is this?
+      
+      The Quantity class captures this richness while remaining simple for basic use.
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      Quantity:
+        quantity_id: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
+        quantity_value: 3
+        quantity_type: STAFF_COUNT
+        quantity_unit: FTE
+        quantity_description: Staff assigned to Zaanstreek-Waterland branch
+        quantity_date: 2025-01-01
+      ```
+    exact_mappings:
+      - qudt:Quantity
+    close_mappings:
+      - schema:QuantitativeValue
+    related_mappings:
+      - schema:numberOfEmployees
+      - schema:floorSize
+      - dcterms:extent
+    slots:
+      - has_or_had_identifier
+      - quantity_value
+      - quantity_type
+      - quantity_unit
+      - has_or_had_description
+      - quantity_date
+      - is_estimate
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      has_or_had_identifier:
+        range: uriorcurie
+        required: false
+        identifier: true
+        description: >-
+          Optional identifier for this quantity measurement.
+        examples:
+          - value: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
+            description: Branch staff count measurement
+      quantity_value:
+        range: float
+        required: true
+        description: >-
+          The numeric value of the quantity.
+        examples:
+          - value: 3
+            description: 3 staff members
+          - value: 1200000
+            description: 1.2 million collection items
+          - value: 2500000
+            description: 2.5 million annual visitors
+      quantity_type:
+        range: QuantityTypeEnum
+        required: false
+        description: >-
+          The type of quantity being measured.
+        examples:
+          - value: STAFF_COUNT
+          - value: COLLECTION_SIZE
+          - value: VISITOR_COUNT
+      quantity_unit:
+        range: string
+        required: false
+        description: >-
+          The unit of measurement (if applicable).
+        examples:
+          - value: FTE
+            description: Full-time equivalent employees
+          - value: headcount
+            description: Total number of people
+          - value: items
+            description: Collection item count
+          - value: linear meters
+            description: Archive extent
+          - value: EUR
+            description: Budget in euros
+          - value: m²
+            description: Floor area
+      has_or_had_description:
+        range: string
+        required: false
+        description: >-
+          Description of what this quantity represents.
+        examples:
+          - value: Staff assigned to Zaanstreek-Waterland branch
+          - value: Annual visitor count for 2024
+      quantity_date:
+        range: date
+        required: false
+        description: >-
+          Date when this quantity was measured or is valid.
+        examples:
+          - value: '2025-01-01'
+      is_estimate:
+        range: boolean
+        required: false
+        ifabsent: 'false'
+        description: >-
+          Whether this quantity is an estimate rather than an exact count.
+        examples:
+          - value: false
+            description: Exact count
+          - value: true
+            description: Estimated value
+    comments:
+      - Quantity models quantified values with units and provenance
+      - Replaces simple integer fields with richer structured data
+      - Uses QUDT Quantity as primary ontology mapping
+      - Supports various quantity types (staff, collection, visitor, budget)
+    see_also:
+      - http://qudt.org/schema/qudt/Quantity
+      - https://schema.org/QuantitativeValue
+    examples:
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
+          quantity_value: 3
+          quantity_type: STAFF_COUNT
+          quantity_unit: FTE
+          has_or_had_description: Staff assigned to Zaanstreek-Waterland branch
+          quantity_date: '2025-01-01'
+          is_estimate: false
+        description: Branch staff count
+      - value:
+          quantity_value: 1200000
+          quantity_type: COLLECTION_SIZE
+          quantity_unit: items
+          has_or_had_description: Total collection size including artworks, documents, and photographs
+          is_estimate: true
+        description: Estimated collection size
+      - value:
+          quantity_value: 2500000
+          quantity_type: VISITOR_COUNT
+          quantity_unit: visitors/year
+          has_or_had_description: Annual visitor count for 2024
+          quantity_date: '2024-12-31'
+          is_estimate: false
+        description: Annual visitor count
+slots:
+  quantity_value:
+    description: >-
+      The numeric value of the quantity.
+    range: float
+    slot_uri: qudt:numericValue
+  quantity_type:
+    description: >-
+      The type of quantity being measured.
+    range: QuantityTypeEnum
+    slot_uri: hc:quantityType
+  quantity_unit:
+    description: >-
+      The unit of measurement (if applicable).
+    range: string
+    slot_uri: qudt:unit
+  quantity_date:
+    description: >-
+      Date when this quantity was measured or is valid.
+    range: date
+    slot_uri: dcterms:date
+  is_estimate:
+    description: >-
+      Whether this quantity is an estimate rather than an exact count.
+    range: boolean
+    slot_uri: hc:isEstimate
--- a/frontend/public/schemas/20251121/linkml/modules/classes/StorageConditionPolicy.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/StorageConditionPolicy.yaml
@ -237,11 +237,20 @@ classes:
        - value: '2020-01-01'
      policy_effective_to:
        range: date
-      policy_approved_by:
-        range: string
+      is_or_was_approved_by:
+        description: >-
+          Agent (person/organization) that approved this policy.
+          MIGRATED from policy_approved_by (2026-01-15) per Rule 39.
+          Range changed from string to Approver class for structured approval tracking.
+        range: Approver
+        required: false
        examples:
-        - value: Collections Committee
-        - value: Director of Collections
+        - value:
+            approver_name: Collections Committee
+          description: Committee approval
+        - value:
+            approver_name: Director of Collections
+          description: Individual approval
      policy_review_date:
        range: date
        examples:
@ -284,7 +293,8 @@ classes:
        - EN_15757_2010
        - EN_16893_2018
        policy_effective_from: '2020-01-01'
-        policy_approved_by: Collections Committee
+        is_or_was_approved_by:
+          approver_name: Collections Committee
        policy_review_date: '2025-12-31'
      description: Museum art storage climate policy
    - value:
@ -313,6 +323,7 @@ classes:
        - IMAGE_PERMANENCE_INSTITUTE
        - ISO_TR_19815_2018
        policy_effective_from: '2015-06-01'
-        policy_approved_by: General Rijksarchivaris
+        is_or_was_approved_by:
+          approver_name: General Rijksarchivaris
        policy_review_date: '2025-06-01'
      description: Archive cold storage policy for photographic materials
--- a/frontend/public/schemas/20251121/linkml/modules/classes/StorageUnit.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/classes/StorageUnit.yaml
@ -195,12 +195,11 @@ classes:
        unit_name: Archive Box 145 - WWII Ministry Records
        unit_type: ARCHIVE_BOX
        unit_description: 'Acid-free archive box containing Ministry of Defense
-
-          correspondence from 1940-1945. Handle with care.
-
-          '
+          correspondence from 1940-1945. Handle with care.'
        row_number: '12'
-        bay_number: '3'
+        has_or_had_identifier:
+          - value: '3'
+            _type: BayNumber
        shelf_number: 4
        part_of_zone: https://nde.nl/ontology/hc/zone/na-depot-a-standard
        valid_from: '2020-03-15'
@ -211,10 +210,7 @@ classes:
        unit_name: Flat File Drawer 42 - Netherlands Maps
        unit_type: FLAT_FILE_DRAWER
        unit_description: 'Flat file drawer containing oversized maps of the
-
-          Netherlands, 1850-1920. Climate-controlled environment.
-
-          '
+          Netherlands, 1850-1920. Climate-controlled environment.'
        drawer_number: 42
        capacity_items: 50
        current_item_count: 38
--- a/frontend/public/schemas/20251121/linkml/modules/enums/AsserterTypeEnum.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/enums/AsserterTypeEnum.yaml
@ -0,0 +1,31 @@
+id: https://nde.nl/ontology/hc/enum/AsserterTypeEnum
+name: AsserterTypeEnum
+title: Asserter Type Enum
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  foaf: http://xmlns.com/foaf/0.1/
+imports:
+- linkml:types
+default_prefix: hc
+enums:
+  AsserterTypeEnum:
+    description: >-
+      Type of agent making an assertion.
+    enum_uri: hc:AsserterTypeEnum
+    permissible_values:
+      HUMAN_ANALYST:
+        description: Human expert or analyst making a judgment.
+        meaning: foaf:Person
+      AUTOMATED_SYSTEM:
+        description: Software system or script performing automated analysis.
+        meaning: prov:SoftwareAgent
+      AI_AGENT:
+        description: AI/ML model or agent making an assertion.
+        meaning: prov:SoftwareAgent
+      ORGANIZATION:
+        description: Organization or institution making a formal assertion.
+        meaning: foaf:Organization
+      UNKNOWN:
+        description: Asserter type is not specified or cannot be determined.
--- a/frontend/public/schemas/20251121/linkml/modules/enums/QuantityTypeEnum.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/enums/QuantityTypeEnum.yaml
@ -0,0 +1,43 @@
+id: https://nde.nl/ontology/hc/enum/QuantityTypeEnum
+name: QuantityTypeEnum
+title: Quantity Type Enum
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  qudt: http://qudt.org/schema/qudt/
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+enums:
+  QuantityTypeEnum:
+    description: >-
+      Type of quantity being measured.
+    enum_uri: hc:QuantityTypeEnum
+    permissible_values:
+      STAFF_COUNT:
+        description: Number of staff members or employees.
+        meaning: schema:numberOfEmployees
+      COLLECTION_SIZE:
+        description: Number of items in a collection.
+        meaning: schema:size
+      VISITOR_COUNT:
+        description: Number of visitors (annual, daily, etc.).
+        meaning: schema:numberOfAttendees
+      BUDGET_AMOUNT:
+        description: Financial amount (budget, revenue, cost).
+        meaning: schema:amount
+      AREA:
+        description: Physical area or floor space.
+        meaning: schema:floorSize
+      DURATION:
+        description: Time duration or period.
+        meaning: schema:duration
+      LINEAR_EXTENT:
+        description: Linear measurement (e.g., archive meters).
+        meaning: qudt:Length
+      CAPACITY:
+        description: Maximum capacity (seats, storage, etc.).
+        meaning: schema:maximumAttendeeCapacity
+      OTHER:
+        description: Other type of quantity not listed.
--- a/frontend/public/schemas/20251121/linkml/modules/slots/approximation_level.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/approximation_level.yaml
@ -0,0 +1,26 @@
+id: https://nde.nl/ontology/hc/slot/approximation_level
+name: approximation_level_slot
+title: Approximation Level Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  approximation_level:
+    description: >-
+      Level of approximation/uncertainty for a value.
+      
+      See ApproximationLevelEnum for valid values:
+      - EXACT: Known with certainty
+      - APPROXIMATE: Close but not exact
+      - ESTIMATED: Calculated/inferred
+      - UNCERTAIN: Significant doubt
+      - UNKNOWN: Cannot be determined
+    range: string
+    slot_uri: hc:approximationLevel
+    annotations:
+      specificity_score: 0.30
+      specificity_rationale: >-
+        Approximation level is broadly useful for expressing uncertainty.
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/approximate_archived_20260114.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/approximate_archived_20260114.yaml
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/asserted_by_archived_20260114.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/asserted_by_archived_20260114.yaml
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/authors_archived_20260114.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/authors_archived_20260114.yaml
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/auxiliary_places_archived_20260114.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/auxiliary_places_archived_20260114.yaml
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/auxiliary_platforms_archived_20260114.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/auxiliary_platforms_archived_20260114.yaml
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/birth_date_archived_20260114.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/birth_date_archived_20260114.yaml
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/birth_place_archived_20260114.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/birth_place_archived_20260114.yaml
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/branch_service_area_archived_20260114.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/branch_service_area_archived_20260114.yaml
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/branch_staff_count_archived_20260114.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/branch_staff_count_archived_20260114.yaml
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/has_author_archived_20260114.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/has_author_archived_20260114.yaml
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/policy_approved_by_archived_20260115.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/policy_approved_by_archived_20260115.yaml
@ -0,0 +1,32 @@
+# ARCHIVED: 2026-01-15
+# REASON: Migrated to is_or_was_approved_by + Approver class (Rule 39, Rule 53)
+# REPLACEMENT: is_or_was_approved_by with range Approver
+# MIGRATION: Migration 30 - approved_by family consolidation
+# 
+# This slot was specific to StorageConditionPolicy. It has been replaced by
+# the generic is_or_was_approved_by slot which uses the Approver class for
+# structured approval tracking with temporal semantics.
+#
+# Original slot preserved below for reference.
+
+id: https://nde.nl/ontology/hc/slot/policy_approved_by
+name: policy_approved_by_slot
+title: Policy Approved By Slot (ARCHIVED)
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  policy_approved_by:
+    description: |
+      ARCHIVED: 2026-01-15
+      REPLACEMENT: is_or_was_approved_by with range Approver
+      
+      Original description:
+      Person or body that approved this policy.
+    range: string
+    slot_uri: hc:policyApprovedBy
+    deprecated: "Use is_or_was_approved_by with Approver class instead"
+    deprecated_element_has_exact_replacement: is_or_was_approved_by
--- a/frontend/public/schemas/20251121/linkml/modules/slots/archive/was_approved_by_archived_20260115.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/archive/was_approved_by_archived_20260115.yaml
@ -0,0 +1,52 @@
+# ARCHIVED: 2026-01-15
+# REASON: Migrated to is_or_was_approved_by + Approver class (Rule 39, Rule 53)
+# REPLACEMENT: is_or_was_approved_by with range Approver
+# MIGRATION: Migration 30 - approved_by family consolidation
+# 
+# This slot was used in Budget class. It has been replaced by the generic
+# is_or_was_approved_by slot which uses the Approver class for structured
+# approval tracking with temporal semantics following RiC-O naming conventions.
+#
+# Original slot preserved below for reference.
+
+id: https://nde.nl/ontology/hc/slot/was_approved_by
+name: was_approved_by_slot
+title: Was Approved By Slot (ARCHIVED)
+prefixes:
+  dcterms: http://purl.org/dc/terms/
+  hc: https://nde.nl/ontology/hc/
+  linkml: https://w3id.org/linkml/
+  prov: http://www.w3.org/ns/prov#
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  was_approved_by:
+    description: |
+      ARCHIVED: 2026-01-15
+      REPLACEMENT: is_or_was_approved_by with range Approver
+      
+      Original description:
+      Governance body or authority that approved budget.
+
+      **Examples**:
+      - "Board of Directors"
+      - "Executive Committee"
+      - "Ministry of Culture"
+      - "City Council"
+    range: string
+    slot_uri: prov:wasAttributedTo
+    exact_mappings:
+    - prov:wasAttributedTo
+    close_mappings:
+    - dcterms:creator
+    - prov:wasInfluencedBy
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Applicable to all heritage custodian types.
+      custodian_types_primary: M
+      specificity_score: 0.5
+      specificity_rationale: Moderately specific slot.
+    deprecated: "Use is_or_was_approved_by with Approver class instead"
+    deprecated_element_has_exact_replacement: is_or_was_approved_by
--- a/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_author.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_author.yaml
@ -0,0 +1,61 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_author
+name: has_or_had_author_slot
+title: Has Or Had Author Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+  bf: http://id.loc.gov/ontologies/bibframe/
+  bibo: http://purl.org/ontology/bibo/
+  rico: https://www.ica.org/standards/RiC/ontology#
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  has_or_had_author:
+    description: >-
+      Person or organization that authored/created a work.
+      
+      Links to Author class which models creators of creative works such as
+      catalogs, publications, reports, and other documentary outputs.
+      
+      **RiC-O Alignment**: Follows RiC-O temporal relationship pattern (has/had)
+      for properties that may change over time (e.g., posthumous attributions,
+      disputed authorship).
+      
+      **Schema.org/Dublin Core Alignment**: Maps to schema:author and dcterms:creator.
+      
+      **BIBFRAME Alignment**: Related to bf:contribution for bibliographic works.
+      
+      **Use Cases**:
+      - Exhibition catalog authors
+      - Research report authors
+      - Finding aid compilers
+      - Publication contributors
+      
+      **MIGRATED from authors (Rule 53)**: Changed from string to Author class
+      for structured authorship modeling including roles, affiliations, and temporal
+      aspects.
+    slot_uri: schema:author
+    range: Author
+    multivalued: true
+    inlined: true
+    exact_mappings:
+      - schema:author
+      - dcterms:creator
+    close_mappings:
+      - bf:contribution
+      - bibo:authorList
+    related_mappings:
+      - rico:hasOrHadAuthor
+    annotations:
+      owl.template: |-
+        AnnotationAssertion( rdfs:label {{slot_uri}} "has or had author"@en )
+      specificity_score: 0.35
+      specificity_rationale: >-
+        Authorship is broadly useful for any creative/documentary work
+        produced by heritage custodians.
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        All custodian types may produce authored works (catalogs, reports, etc.).
--- a/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_auxiliary_entities.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_auxiliary_entities.yaml
@ -0,0 +1,58 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_auxiliary_entities
+name: has_or_had_auxiliary_entities_slot
+title: Has Or Had Auxiliary Entities Slot
+description: |
+  Generic slot for auxiliary/supporting entities associated with a primary entity.
+  
+  CREATED as part of slot migration (Rule 53) to replace:
+  - `auxiliary_places` → range: AuxiliaryPlace
+  - `auxiliary_platforms` → range: AuxiliaryPlatform
+  
+  Follows RiC-O temporal predicate pattern (has_or_had_*).
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  rico: https://www.ica.org/standards/RiC/ontology#
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  has_or_had_auxiliary_entities:
+    description: >-
+      Auxiliary or supporting entities associated with the primary entity.
+      
+      **SEMANTIC PATTERN**:
+      
+      This slot follows the RiC-O temporal predicate pattern (has_or_had_*)
+      to indicate that auxiliary relationships may change over time.
+      
+      **REPLACES**:
+      
+      - `auxiliary_places` - Physical locations supporting the main entity
+      - `auxiliary_platforms` - Digital platforms supporting the main entity
+      
+      **USE CASES**:
+      
+      1. **Storage locations**: Off-site storage, external repositories
+      2. **Branch facilities**: Satellite offices, reading rooms
+      3. **Partner platforms**: External discovery services, aggregators
+      
+    slot_uri: rico:hasOrHadPart
+    range: uriorcurie
+    multivalued: true
+    exact_mappings:
+    - rico:hasOrHadPart
+    close_mappings:
+    - schema:hasPart
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Applicable to all heritage custodian types.
+      custodian_types_primary: M
+      specificity_score: 0.4
+      specificity_rationale: Broadly applicable auxiliary entity relationship.
+    examples:
+    - value: "hc:auxiliary-place/rijksmuseum-depot-amersfoort"
+      description: Off-site storage depot
+    - value: "hc:auxiliary-platform/europeana-aggregation"
+      description: External discovery platform
--- a/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_date_of_birth.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_date_of_birth.yaml
@ -0,0 +1,61 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_date_of_birth
+name: has_or_had_date_of_birth_slot
+title: Has or Had Date of Birth Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  rico: https://www.ica.org/standards/RiC/ontology#
+  foaf: http://xmlns.com/foaf/0.1/
+imports:
+  - linkml:types
+default_prefix: hc
+slots:
+  has_or_had_date_of_birth:
+    slot_uri: schema:birthDate
+    description: >-
+      The birth date of a person, modeled as a structured BirthDate class.
+      
+      **TEMPORAL SEMANTICS (RiC-O Pattern)**:
+      
+      Uses "has_or_had" prefix to indicate the relationship may be:
+      - Current (person is alive with this birth date)
+      - Historical (person is deceased, birth date is historical fact)
+      
+      **ONTOLOGY ALIGNMENT**:
+      
+      | Ontology | Property | Usage |
+      |----------|----------|-------|
+      | **Schema.org** | `schema:birthDate` | Primary property (web semantics) |
+      | **FOAF** | `foaf:birthday` | Social network date |
+      | **CIDOC-CRM** | `crm:P98i_was_born` → `crm:E67_Birth` | Birth event |
+      | **RiC-O** | `rico:birthDate` | Archival person modeling |
+      
+      **INCOMPLETE DATES**:
+      
+      Per Rule 44 (EDTF), incomplete dates are modeled using BirthDate class:
+      - Decade known: `birth_edtf: "197X"`
+      - Century known: `birth_edtf: "19XX"`
+      - Approximate: `birth_edtf: "1985~"`
+      
+      **MIGRATION NOTE**:
+      
+      Replaces simple `birth_date` string slot with structured BirthDate class
+      per Rule 53 (Full Slot Migration). This enables:
+      - EDTF date notation support
+      - Provenance tracking for inferred dates
+      - Confidence scoring
+    range: BirthDate
+    required: false
+    inlined: true
+    exact_mappings:
+      - schema:birthDate
+      - foaf:birthday
+    close_mappings:
+      - crm:P98i_was_born
+      - rico:birthDate
+    comments:
+      - "MIGRATED from birth_date slot (Rule 53)"
+      - "Supports EDTF notation for uncertain/incomplete dates"
+      - "BirthDate class provides provenance for inferred birth dates"
--- a/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_place_of_birth.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_place_of_birth.yaml
@ -0,0 +1,58 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_place_of_birth
+name: has_or_had_place_of_birth_slot
+title: Has or Had Place of Birth Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  rico: https://www.ica.org/standards/RiC/ontology#
+  foaf: http://xmlns.com/foaf/0.1/
+imports:
+  - linkml:types
+default_prefix: hc
+slots:
+  has_or_had_place_of_birth:
+    slot_uri: schema:birthPlace
+    description: >-
+      The place where a person was born, modeled as a structured BirthPlace class.
+      
+      **TEMPORAL SEMANTICS (RiC-O Pattern)**:
+      
+      Uses "has_or_had" prefix to indicate the relationship:
+      - Historical fact (birth location doesn't change)
+      - May use historical place names vs. modern equivalents
+      
+      **ONTOLOGY ALIGNMENT**:
+      
+      | Ontology | Property | Usage |
+      |----------|----------|-------|
+      | **Schema.org** | `schema:birthPlace` | Primary property |
+      | **FOAF** | `foaf:based_near` | Location association |
+      | **CIDOC-CRM** | `crm:P7_took_place_at` via Birth event | Place of birth event |
+      | **RiC-O** | `rico:birthPlace` | Archival person modeling |
+      
+      **PLACE RESOLUTION**:
+      
+      BirthPlace class enables:
+      - Historical place name preservation (e.g., "Batavia")
+      - Modern equivalent linkage (e.g., "Jakarta")
+      - GeoNames/Wikidata identifier linking
+      - Coordinate storage for mapping
+      
+      **MIGRATION NOTE**:
+      
+      Replaces simple `birth_place` string slot with structured BirthPlace class
+      per Rule 53 (Full Slot Migration).
+    range: BirthPlace
+    required: false
+    inlined: true
+    exact_mappings:
+      - schema:birthPlace
+    close_mappings:
+      - crm:P7_took_place_at
+      - rico:birthPlace
+    comments:
+      - "MIGRATED from birth_place slot (Rule 53)"
+      - "Supports historical vs. modern place names"
+      - "Links to GeoNames/Wikidata for disambiguation"
--- a/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_quantity.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_quantity.yaml
@ -0,0 +1,39 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_quantity
+name: has_or_had_quantity_slot
+title: Has Or Had Quantity Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  qudt: http://qudt.org/schema/qudt/
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  has_or_had_quantity:
+    description: >-
+      A quantified value associated with an entity. Uses RiC-O temporal
+      naming pattern to indicate the quantity may be current or historical.
+      
+      QUDT: Quantity - "A quantitative value expressed as a number and
+      a unit of measurement."
+      
+      Can represent staff counts, collection sizes, visitor numbers,
+      budget amounts, area measurements, and other quantifiable properties.
+    range: Quantity
+    slot_uri: qudt:Quantity
+    exact_mappings:
+      - qudt:Quantity
+    close_mappings:
+      - schema:QuantitativeValue
+    related_mappings:
+      - schema:numberOfEmployees
+      - schema:floorSize
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Quantities can be associated with any heritage custodian type.
+      custodian_types_primary: M
+      specificity_score: 0.3
+      specificity_rationale: >-
+        Generic quantity slot applicable across many contexts where
+        quantitative values need to be captured with units and provenance.
--- a/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_service_area.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_service_area.yaml
@ -0,0 +1,54 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_service_area
+name: has_or_had_service_area_slot
+title: Has Or Had Service Area Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  org: http://www.w3.org/ns/org#
+  rico: https://www.ica.org/standards/RiC/ontology#
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  has_or_had_service_area:
+    description: >-
+      Geographic area or community served by an entity.
+      
+      Links to ServiceArea class which models the "werkgebied" (operational territory)
+      of heritage custodians - the geographic area where they provide services and
+      collect materials.
+      
+      **RiC-O Alignment**: Follows RiC-O temporal relationship pattern (has/had)
+      for properties that may change over time.
+      
+      **Schema.org Alignment**: Maps to schema:areaServed for service coverage.
+      
+      **Use Cases**:
+      - Archive branch serving specific municipalities
+      - Library branch serving neighborhood/district
+      - Museum outpost serving regional community
+      
+      **MIGRATED from branch_service_area (Rule 53)**: Changed from string to
+      ServiceArea class for richer geographic modeling including boundaries,
+      temporal validity, and administrative hierarchy.
+    slot_uri: schema:areaServed
+    range: ServiceArea
+    inlined: true
+    exact_mappings:
+      - schema:areaServed
+    close_mappings:
+      - org:hasSite
+      - rico:hasOrHadLocation
+    annotations:
+      owl.template: |-
+        AnnotationAssertion( rdfs:label {{slot_uri}} "has or had service area"@en )
+      specificity_score: 0.45
+      specificity_rationale: >-
+        Service area is moderately specific - relevant for organizational/geographic
+        contexts but not universally applicable.
+      custodian_types: '["A", "L", "M", "O", "R"]'
+      custodian_types_rationale: >-
+        Service areas are most relevant to archives (A), libraries (L), museums (M),
+        official institutions (O), and research centers (R) that have geographic
+        service mandates.
--- a/frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_approximate.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_approximate.yaml
@ -0,0 +1,54 @@
+id: https://nde.nl/ontology/hc/slot/is_or_was_approximate
+name: is_or_was_approximate_slot
+title: Is Or Was Approximate Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  rico: https://www.ica.org/standards/RiC/ontology#
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  is_or_was_approximate:
+    description: >-
+      Indicates whether a value (date, quantity, etc.) is approximate or uncertain.
+      
+      Links to ApproximationStatus class which models different levels of uncertainty:
+      - exact: Known with certainty
+      - approximate: Close but not exact (circa, roughly)
+      - estimated: Calculated/inferred value
+      - uncertain: Significant doubt about accuracy
+      - unknown: Value cannot be determined
+      
+      **RiC-O Alignment**: Follows RiC-O temporal relationship pattern (is/was)
+      for properties that may change over time as more information becomes available.
+      
+      **CIDOC-CRM Alignment**: Related to crm:E52_Time-Span precision modeling.
+      
+      **Use Cases**:
+      - Date approximation: "circa 1880" vs "1880-03-15"
+      - Event timing uncertainty: founding date known only to year
+      - Quantity estimates: "approximately 10,000 items"
+      
+      **MIGRATED from approximate (Rule 53)**: Changed from string to
+      ApproximationStatus class for structured uncertainty modeling.
+    slot_uri: hc:isOrWasApproximate
+    range: ApproximationStatus
+    inlined: true
+    close_mappings:
+      - crm:P79_beginning_is_qualified_by
+      - crm:P80_end_is_qualified_by
+    related_mappings:
+      - rico:certainty
+    annotations:
+      owl.template: |-
+        AnnotationAssertion( rdfs:label {{slot_uri}} "is or was approximate"@en )
+      specificity_score: 0.30
+      specificity_rationale: >-
+        Approximation status is broadly useful across many contexts where
+        uncertainty needs to be expressed (dates, quantities, etc.).
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Approximation/uncertainty is universal across all custodian types.
--- a/frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_asserted_by.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_asserted_by.yaml
@ -0,0 +1,38 @@
+id: https://nde.nl/ontology/hc/slot/is_or_was_asserted_by
+name: is_or_was_asserted_by_slot
+title: Is Or Was Asserted By Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  dcterms: http://purl.org/dc/terms/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  is_or_was_asserted_by:
+    description: >-
+      The agent (person, organization, or system) responsible for making
+      an assertion. Uses RiC-O temporal naming pattern to indicate the
+      relationship may be current or historical.
+      
+      PROV-O: wasAttributedTo - "links an entity to an agent that it
+      may have been attributed to."
+      
+      Can be a human analyst, automated system, or AI agent.
+    range: Asserter
+    slot_uri: prov:wasAttributedTo
+    exact_mappings:
+      - prov:wasAttributedTo
+    close_mappings:
+      - dcterms:creator
+    related_mappings:
+      - prov:wasAssociatedWith
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Assertions can be made about any heritage custodian type.
+      custodian_types_primary: M
+      specificity_score: 0.4
+      specificity_rationale: >-
+        Generic provenance slot applicable across many contexts where
+        attribution of assertions is needed.
--- a/frontend/public/schemas/20251121/linkml/modules/slots/policy_approved_by.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/policy_approved_by.yaml
@ -1,16 +0,0 @@
-id: https://nde.nl/ontology/hc/slot/policy_approved_by
-name: policy_approved_by_slot
-title: Policy Approved By Slot
-prefixes:
-  linkml: https://w3id.org/linkml/
-  hc: https://nde.nl/ontology/hc/
-imports:
- linkml:types
-default_prefix: hc
-slots:
-  policy_approved_by:
-    description: 'Person or body that approved this policy.
-
-      '
-    range: string
-    slot_uri: hc:policyApprovedBy
--- a/frontend/public/schemas/20251121/linkml/modules/slots/slot_fixes.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/slot_fixes.yaml
@ -421,10 +421,22 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/approved_by
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires Approver class creation"
+        status: true
+        timestamp: '2026-01-15T10:00:00Z'
+        session: "slot-migration-session-30"
+        notes: |
+          MIGRATED: approved_by family → is_or_was_approved_by + Approver (Migration 30)
+          
+          This migration consolidated 3 related slots:
+          - approved_by (already archived 2026-01-14)
+          - was_approved_by → archived to archive/was_approved_by_archived_20260115.yaml
+          - policy_approved_by → archived to archive/policy_approved_by_archived_20260115.yaml
+          
+          Classes updated:
+          - Budget.yaml: Fixed malformed slot name, updated slot_usage to use Approver range
+          - StorageConditionPolicy.yaml: Updated slots and slot_usage, migrated examples
+          
+          All three slots now consolidated into is_or_was_approved_by with range Approver.
      revision:
        - label: is_or_was_approved_by
          type: slot
@ -433,10 +445,10 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/approximate
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires ApproximationStatus class creation"
+        status: true
+        timestamp: "2026-01-14T12:45:00Z"
+        session: "slot-migration-session-20260114"
+        notes: "COMPLETED: Created is_or_was_approximate slot and ApproximationStatus class with ApproximationLevelEnum (EXACT, APPROXIMATE, ESTIMATED, UNCERTAIN, UNKNOWN). Also created approximation_level slot. Updated CustodianTimelineEvent.yaml imports, slots list, slot_usage with range ApproximationStatus, and examples (added 5th example showing approximate date). Archived approximate to archive/approximate_archived_20260114.yaml"
      revision:
        - label: is_or_was_approximate
          type: slot
@ -445,10 +457,18 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/archived_at
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Maps to existing HeritageCustodianPlace class"
+        status: true
+        timestamp: '2026-01-15T09:00:00Z'
+        session: "slot-migration-session-29"
+        notes: |
+          MIGRATED: archived_at → is_or_was_archived_at (Migration 29)
+          
+          Applied RiC-O temporal naming convention (Rule 39).
+          Updated classes:
+          - WebObservation.yaml
+          - AuxiliaryDigitalPlatform.yaml
+          
+          Archived to modules/slots/archive/archived_at_archived_20260115.yaml
      revision:
        - label: is_or_was_archived_at
          type: slot
@ -489,10 +509,10 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/asserted_by
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires Asserter class creation"
+        status: true
+        timestamp: '2026-01-14T23:30:00Z'
+        session: "session-2026-01-14-slot-migrations"
+        notes: "FULLY MIGRATED: Created is_or_was_asserted_by slot, Asserter class, and AsserterTypeEnum. PrimaryDigitalPresenceAssertion.yaml updated with new imports, slots, and slot_usage. Old asserted_by slot archived to archive/asserted_by_archived_20260114.yaml."
      revision:
        - label: is_or_was_asserted_by
          type: slot
@ -546,10 +566,14 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/audio_event_segments
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Maps to existing AudioEventSegment class"
+        status: true
+        timestamp: "2026-01-14T10:30:00Z"
+        session: "slot-migration-session-8"
+        notes: |
+          MIGRATED: audio_event_segments → has_or_had_segment + AudioEventSegment
+          - Created AudioEventSegment.yaml class (hc:AudioEventSegment)
+          - Updated VideoAudioAnnotation.yaml: imports, slots, slot_usage
+          - Archived to modules/slots/archive/audio_event_segments_archived_20260114.yaml
      revision:
        - label: has_or_had_segment
          type: slot
@ -570,10 +594,10 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/authors
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires Author class creation"
+        status: true
+        timestamp: '2026-01-14T15:30:00Z'
+        session: "session-2026-01-14-author-migration"
+        notes: "FULLY MIGRATED: ExhibitionCatalog.yaml - authors and has_author slots replaced with has_or_had_author (range: Author). Author class with AuthorRoleEnum created. Both authors.yaml and has_author.yaml archived."
      revision: 
        - label: has_or_had_author
          type: slot
@ -606,10 +630,15 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/auxiliary_places
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Maps to existing AuxiliaryPlace class"
+        status: true
+        timestamp: '2026-01-14T11:30:00Z'
+        session: "slot-migration-session-8"
+        notes: |
+          MIGRATED: auxiliary_places → has_or_had_auxiliary_entities + AuxiliaryPlace
+          - Created has_or_had_auxiliary_entities.yaml slot
+          - AuxiliaryPlace class already existed
+          - Updated CustodianPlace.yaml: imports, slots list, slot_usage
+          - Archived to modules/slots/archive/auxiliary_places_archived_20260114.yaml
      revision:
        - label: has_or_had_auxiliary_entities
          type: slot
@ -630,10 +659,15 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/auxiliary_platforms
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Maps to existing AuxiliaryPlatform class"
+        status: true
+        timestamp: '2026-01-14T11:45:00Z'
+        session: "slot-migration-session-8"
+        notes: |
+          MIGRATED: auxiliary_platforms → has_or_had_auxiliary_entities + AuxiliaryDigitalPlatform
+          - has_or_had_auxiliary_entities slot created earlier this session
+          - AuxiliaryDigitalPlatform class already existed
+          - Updated DigitalPlatform.yaml: imports, slots list, slot_usage
+          - Archived to modules/slots/archive/auxiliary_platforms_archived_20260114.yaml
      revision:
        - label: has_or_had_auxiliary_entities
          type: slot
@ -686,10 +720,14 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/bay_number
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires BayNumber class creation"
+        status: true
+        timestamp: "2026-01-14T10:45:00Z"
+        session: "slot-migration-session-8"
+        notes: |
+          MIGRATED: bay_number → has_or_had_identifier + BayNumber
+          - Created BayNumber.yaml class (hc:BayNumber)
+          - Updated StorageUnit.yaml: imports, slots, slot_usage
+          - Archived to modules/slots/archive/bay_number_archived_20260114.yaml
      revision: 
        - label: has_or_had_identifier
          type: slot
@ -827,10 +865,10 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/birth_date
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires BirthDate class creation"
+        status: true
+        timestamp: '2026-01-14T16:00:00Z'
+        session: "session-2026-01-14-birth-date-migration"
+        notes: "FULLY MIGRATED: PersonObservation.yaml - birth_date replaced with has_or_had_date_of_birth (range: BirthDate). BirthDate class created with EDTF support, confidence enum, and inference provenance. birth_date.yaml archived."
      revision:
        - label: has_or_had_date_of_birth
          type: slot
@ -839,10 +877,10 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/birth_place
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires BirthPlace class creation"
+        status: true
+        timestamp: '2026-01-14T16:15:00Z'
+        session: "session-2026-01-14-birth-place-migration"
+        notes: "FULLY MIGRATED: PersonObservation.yaml - birth_place replaced with has_or_had_place_of_birth (range: BirthPlace). BirthPlace class created with historical/modern place names, GeoNames/Wikidata integration. birth_place.yaml archived."
      revision:
        - label: has_or_had_place_of_birth
          type: slot
@ -939,10 +977,14 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/box_number
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires BoxNumber class creation"
+        status: true
+        timestamp: "2026-01-14T10:45:00Z"
+        session: "slot-migration-session-8"
+        notes: |
+          MIGRATED: box_number → has_or_had_identifier + BoxNumber
+          - Created BoxNumber.yaml class (hc:BoxNumber)
+          - Updated StorageUnit.yaml: imports, slots, slot_usage
+          - Archived to modules/slots/archive/box_number_archived_20260114.yaml
      revision: 
        - label: has_or_had_identifier
          type: slot
@ -1035,10 +1077,10 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/branch_service_area
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires ServiceArea class creation"
+        status: true
+        timestamp: "2026-01-14T12:30:00Z"
+        session: "slot-migration-session-20260114"
+        notes: "COMPLETED: Created has_or_had_service_area slot with range ServiceArea. Updated BranchOffice.yaml imports, slots list, slot_usage, and examples. ServiceArea class already existed with full geographic modeling. Archived branch_service_area to archive/branch_service_area_archived_20260114.yaml"
      revision:
        - label: has_or_had_service_area
          type: slot
@ -1047,10 +1089,10 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/branch_staff_count
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Maps to existing Quantity class"
+        status: true
+        timestamp: '2026-01-14T23:35:00Z'
+        session: "session-2026-01-14-slot-migrations"
+        notes: "FULLY MIGRATED: Created has_or_had_quantity slot, Quantity class, and QuantityTypeEnum. BranchOffice.yaml updated with new imports, slots, and slot_usage. Old branch_staff_count slot archived to archive/branch_staff_count_archived_20260114.yaml. Quantity class supports staff counts, collection sizes, visitor counts, budget amounts, etc."
      revision:
        - label: has_or_had_quantity
          type: slot
@ -1177,10 +1219,14 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/budget_status
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires BudgetStatus class creation"
+        status: true
+        timestamp: '2026-01-14T11:00:00Z'
+        session: "slot-migration-session-8"
+        notes: |
+          MIGRATED: budget_status → has_or_had_status + BudgetStatus
+          - Created BudgetStatus.yaml class (hc:BudgetStatus)
+          - Updated Budget.yaml: imports, slots list, slot_usage, examples
+          - Archived to modules/slots/archive/budget_status_archived_20260114.yaml
      revision:
        - label: has_or_had_status
          type: slot
@ -2128,7 +2174,53 @@ fixes:
          type: slot  
        - label: ApprovalTimeTypes
          type: class
-    
-
-
-  
+    - original_slot_id: https://nde.nl/ontology/hc/slot/type_status
+      revision:
+        - label: has_or_had_status
+          type: slot
+        - label: TypeStatus
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/type_scope
+      revision:
+        - label: has_or_had_scope
+          type: slot
+        - label: Scope
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: ScopeType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: ScopeTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/type_label
+      revision:
+        - label: has_or_had_label
+          type: slot
+        - label: Label
+          type: class
+        - label: has_or_had_language
+          type: slot
+        - label: Language 
+          type: class 
+        - label: has_or_had_identifier
+          type: slot
+        - label: ISO639-3Identifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/type_id
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: Identifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/type_hypothesis
+      revision:
+        - label: has_or_had_provenance
+          type: slot
+        - label: Provenance
+          type: class
+        - label: asserts_or_asserted
+          type: slot
+        - label: Hypothesis
+          type: class
--- a/frontend/public/schemas/20251121/linkml/modules/slots/was_approved_by.yaml
+++ b/frontend/public/schemas/20251121/linkml/modules/slots/was_approved_by.yaml
@ -1,41 +0,0 @@
-id: https://nde.nl/ontology/hc/slot/was_approved_by
-name: was_approved_by_slot
-title: Was Approved By Slot
-prefixes:
-  dcterms: http://purl.org/dc/terms/
-  hc: https://nde.nl/ontology/hc/
-  linkml: https://w3id.org/linkml/
-  prov: http://www.w3.org/ns/prov#
-  schema: http://schema.org/
-imports:
- linkml:types
-default_prefix: hc
-slots:
-  was_approved_by:
-    description: 'Governance body or authority that approved budget.
-
-
-      **Examples**:
-
-      - "Board of Directors"
-
-      - "Executive Committee"
-
-      - "Ministry of Culture"
-
-      - "City Council"
-
-      '
-    range: string
-    slot_uri: prov:wasAttributedTo
-    exact_mappings:
-    - prov:wasAttributedTo
-    close_mappings:
-    - dcterms:creator
-    - prov:wasInfluencedBy
-    annotations:
-      custodian_types: '["*"]'
-      custodian_types_rationale: Applicable to all heritage custodian types.
-      custodian_types_primary: M
-      specificity_score: 0.5
-      specificity_rationale: Moderately specific slot.
--- a/frontend/src/pages/EntityReviewPage.tsx
+++ b/frontend/src/pages/EntityReviewPage.tsx
@ -1145,6 +1145,36 @@ export default function EntityReviewPage() {
                        <span className="divider-text">
                          {language === 'nl' ? 'of voeg handmatig toe' : 'or add manually'}
                        </span>
+                        <Tooltip 
+                          position="bottom"
+                          maxWidth={350}
+                          content={
+                            <div style={{ textAlign: 'left', fontSize: '12px', lineHeight: '1.5' }}>
+                              <strong style={{ display: 'block', marginBottom: '6px' }}>
+                                {language === 'nl' ? 'Profiel Ophalen Providers:' : 'Profile Fetching Providers:'}
+                              </strong>
+                              <div style={{ marginBottom: '8px' }}>
+                                <strong>LinkedIn:</strong>{' '}
+                                {language === 'nl' 
+                                  ? 'Exa API (werkt) – Linkup API kan LinkedIn niet benaderen vanwege anti-scraping beveiliging'
+                                  : 'Exa API (works) – Linkup API cannot access LinkedIn due to anti-scraping protections'}
+                              </div>
+                              <div style={{ marginBottom: '8px' }}>
+                                <strong>Facebook:</strong>{' '}
+                                {language === 'nl'
+                                  ? 'Noch Exa noch Linkup kan Facebook profielen ophalen – gespecialiseerde diensten (Apify, Bright Data) vereist'
+                                  : 'Neither Exa nor Linkup can access Facebook profiles – specialized services (Apify, Bright Data) required'}
+                              </div>
+                              <div style={{ fontSize: '11px', opacity: 0.85, borderTop: '1px solid rgba(255,255,255,0.2)', paddingTop: '6px', marginTop: '4px' }}>
+                                {language === 'nl'
+                                  ? 'Wanneer u een LinkedIn URL toevoegt, haalt het systeem automatisch profielgegevens op via Exa.'
+                                  : 'When you add a LinkedIn URL, the system automatically fetches profile data using Exa.'}
+                              </div>
+                            </div>
+                          }
+                        >
+                          <Info size={14} className="info-icon" style={{ marginLeft: '6px', opacity: 0.6, cursor: 'help' }} />
+                        </Tooltip>
                      </div>
                      <div className="manual-linkedin-input-group">
                        <input
--- a/schemas/20251121/linkml/manifest.json
+++ b/schemas/20251121/linkml/manifest.json
@ -1,12 +1,12 @@
 {
-  "generated": "2026-01-14T15:04:09.918Z",
+  "generated": "2026-01-14T15:54:10.748Z",
  "schemaRoot": "/schemas/20251121/linkml",
-  "totalFiles": 2883,
+  "totalFiles": 2888,
  "categoryCounts": {
    "main": 4,
-    "class": 683,
-    "enum": 147,
-    "slot": 2045,
+    "class": 689,
+    "enum": 149,
+    "slot": 2042,
    "module": 4
  },
  "categories": [
@ -165,6 +165,11 @@
          "path": "modules/classes/Approver.yaml",
          "category": "class"
        },
+        {
+          "name": "ApproximationStatus",
+          "path": "modules/classes/ApproximationStatus.yaml",
+          "category": "class"
+        },
        {
          "name": "ArchitecturalArchive",
          "path": "modules/classes/ArchitecturalArchive.yaml",
@ -275,6 +280,11 @@
          "path": "modules/classes/ArticlesOfAssociation.yaml",
          "category": "class"
        },
+        {
+          "name": "Asserter",
+          "path": "modules/classes/Asserter.yaml",
+          "category": "class"
+        },
        {
          "name": "AssociationArchive",
          "path": "modules/classes/AssociationArchive.yaml",
@ -300,6 +310,11 @@
          "path": "modules/classes/AudiovisualArchiveRecordSetTypes.yaml",
          "category": "class"
        },
+        {
+          "name": "Author",
+          "path": "modules/classes/Author.yaml",
+          "category": "class"
+        },
        {
          "name": "AutoGeneration",
          "path": "modules/classes/AutoGeneration.yaml",
@ -380,6 +395,16 @@
          "path": "modules/classes/BiologicalObject.yaml",
          "category": "class"
        },
+        {
+          "name": "BirthDate",
+          "path": "modules/classes/BirthDate.yaml",
+          "category": "class"
+        },
+        {
+          "name": "BirthPlace",
+          "path": "modules/classes/BirthPlace.yaml",
+          "category": "class"
+        },
        {
          "name": "BOLDIdentifier",
          "path": "modules/classes/BOLDIdentifier.yaml",
@ -2430,6 +2455,11 @@
          "path": "modules/classes/PublicationEntry.yaml",
          "category": "class"
        },
+        {
+          "name": "Quantity",
+          "path": "modules/classes/Quantity.yaml",
+          "category": "class"
+        },
        {
          "name": "RadioArchive",
          "path": "modules/classes/RadioArchive.yaml",
@ -3486,6 +3516,11 @@
          "path": "modules/enums/ArchiveProcessingStatusEnum.yaml",
          "category": "enum"
        },
+        {
+          "name": "AsserterTypeEnum",
+          "path": "modules/enums/AsserterTypeEnum.yaml",
+          "category": "enum"
+        },
        {
          "name": "AudioEventTypeEnum",
          "path": "modules/enums/AudioEventTypeEnum.yaml",
@ -3991,6 +4026,11 @@
          "path": "modules/enums/ProvenanceEventTypeEnum.yaml",
          "category": "enum"
        },
+        {
+          "name": "QuantityTypeEnum",
+          "path": "modules/enums/QuantityTypeEnum.yaml",
+          "category": "enum"
+        },
        {
          "name": "ReadingRoomAnnexReasonEnum",
          "path": "modules/enums/ReadingRoomAnnexReasonEnum.yaml",
@ -4248,8 +4288,8 @@
          "category": "slot"
        },
        {
-          "name": "approximate",
-          "path": "modules/slots/approximate.yaml",
+          "name": "approximation_level",
+          "path": "modules/slots/approximation_level.yaml",
          "category": "slot"
        },
        {
@ -4262,26 +4302,6 @@
          "path": "modules/slots/arrangement_notes.yaml",
          "category": "slot"
        },
-        {
-          "name": "asserted_by",
-          "path": "modules/slots/asserted_by.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "authors",
-          "path": "modules/slots/authors.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "auxiliary_places",
-          "path": "modules/slots/auxiliary_places.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "auxiliary_platforms",
-          "path": "modules/slots/auxiliary_platforms.yaml",
-          "category": "slot"
-        },
        {
          "name": "available_caption_languages",
          "path": "modules/slots/available_caption_languages.yaml",
@ -4322,16 +4342,6 @@
          "path": "modules/slots/bio_type_classification.yaml",
          "category": "slot"
        },
-        {
-          "name": "birth_date",
-          "path": "modules/slots/birth_date.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "birth_place",
-          "path": "modules/slots/birth_place.yaml",
-          "category": "slot"
-        },
        {
          "name": "borrower",
          "path": "modules/slots/borrower.yaml",
@ -4352,16 +4362,6 @@
          "path": "modules/slots/branch_head.yaml",
          "category": "slot"
        },
-        {
-          "name": "branch_service_area",
-          "path": "modules/slots/branch_service_area.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "branch_staff_count",
-          "path": "modules/slots/branch_staff_count.yaml",
-          "category": "slot"
-        },
        {
          "name": "budget_currency",
          "path": "modules/slots/budget_currency.yaml",
@ -7677,11 +7677,6 @@
          "path": "modules/slots/has_authentication_required_flag.yaml",
          "category": "slot"
        },
-        {
-          "name": "has_author",
-          "path": "modules/slots/has_author.yaml",
-          "category": "slot"
-        },
        {
          "name": "has_authority_file_abbreviation",
          "path": "modules/slots/has_authority_file_abbreviation.yaml",
@ -8147,6 +8142,16 @@
          "path": "modules/slots/has_or_had_audit_status.yaml",
          "category": "slot"
        },
+        {
+          "name": "has_or_had_author",
+          "path": "modules/slots/has_or_had_author.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "has_or_had_auxiliary_entities",
+          "path": "modules/slots/has_or_had_auxiliary_entities.yaml",
+          "category": "slot"
+        },
        {
          "name": "has_or_had_based_on_observation",
          "path": "modules/slots/has_or_had_based_on_observation.yaml",
@ -8227,6 +8232,11 @@
          "path": "modules/slots/has_or_had_data_service_endpoint.yaml",
          "category": "slot"
        },
+        {
+          "name": "has_or_had_date_of_birth",
+          "path": "modules/slots/has_or_had_date_of_birth.yaml",
+          "category": "slot"
+        },
        {
          "name": "has_or_had_depositing_organization",
          "path": "modules/slots/has_or_had_depositing_organization.yaml",
@ -8537,6 +8547,11 @@
          "path": "modules/slots/has_or_had_period.yaml",
          "category": "slot"
        },
+        {
+          "name": "has_or_had_place_of_birth",
+          "path": "modules/slots/has_or_had_place_of_birth.yaml",
+          "category": "slot"
+        },
        {
          "name": "has_or_had_portal_data_source",
          "path": "modules/slots/has_or_had_portal_data_source.yaml",
@ -8582,6 +8597,11 @@
          "path": "modules/slots/has_or_had_provenance_event.yaml",
          "category": "slot"
        },
+        {
+          "name": "has_or_had_quantity",
+          "path": "modules/slots/has_or_had_quantity.yaml",
+          "category": "slot"
+        },
        {
          "name": "has_or_had_registered_dataset",
          "path": "modules/slots/has_or_had_registered_dataset.yaml",
@ -8672,6 +8692,11 @@
          "path": "modules/slots/has_or_had_series.yaml",
          "category": "slot"
        },
+        {
+          "name": "has_or_had_service_area",
+          "path": "modules/slots/has_or_had_service_area.yaml",
+          "category": "slot"
+        },
        {
          "name": "has_or_had_short_code",
          "path": "modules/slots/has_or_had_short_code.yaml",
@ -9492,6 +9517,11 @@
          "path": "modules/slots/is_or_was_approved_by.yaml",
          "category": "slot"
        },
+        {
+          "name": "is_or_was_approximate",
+          "path": "modules/slots/is_or_was_approximate.yaml",
+          "category": "slot"
+        },
        {
          "name": "is_or_was_archive_department_of",
          "path": "modules/slots/is_or_was_archive_department_of.yaml",
@ -9507,6 +9537,11 @@
          "path": "modules/slots/is_or_was_archived_in.yaml",
          "category": "slot"
        },
+        {
+          "name": "is_or_was_asserted_by",
+          "path": "modules/slots/is_or_was_asserted_by.yaml",
+          "category": "slot"
+        },
        {
          "name": "is_or_was_associated_with",
          "path": "modules/slots/is_or_was_associated_with.yaml",
@ -11437,11 +11472,6 @@
          "path": "modules/slots/platform_url.yaml",
          "category": "slot"
        },
-        {
-          "name": "policy_approved_by",
-          "path": "modules/slots/policy_approved_by.yaml",
-          "category": "slot"
-        },
        {
          "name": "policy_authority",
          "path": "modules/slots/policy_authority.yaml",
@ -14257,11 +14287,6 @@
          "path": "modules/slots/warehouse_security_level.yaml",
          "category": "slot"
        },
-        {
-          "name": "was_approved_by",
-          "path": "modules/slots/was_approved_by.yaml",
-          "category": "slot"
-        },
        {
          "name": "was_archived_at",
          "path": "modules/slots/was_archived_at.yaml",
--- a/schemas/20251121/linkml/modules/classes/Asserter.yaml
+++ b/schemas/20251121/linkml/modules/classes/Asserter.yaml
@ -0,0 +1,180 @@
+id: https://nde.nl/ontology/hc/class/Asserter
+name: Asserter
+title: Asserter Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  foaf: http://xmlns.com/foaf/0.1/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+imports:
+- linkml:types
+- ../enums/AsserterTypeEnum
+- ../slots/has_or_had_identifier
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  Asserter:
+    class_uri: prov:Agent
+    description: >-
+      An agent (person, organization, or system) responsible for making
+      an assertion about a heritage entity.
+      
+      **PROV-O ALIGNMENT**:
+      
+      Maps to `prov:Agent` - "An agent is something that bears some form
+      of responsibility for an activity taking place, for the existence
+      of an entity, or for another agent's activity."
+      
+      **TYPES OF ASSERTERS**:
+      
+      | Type | Description | Example |
+      |------|-------------|---------|
+      | HUMAN_ANALYST | Expert making judgment | "jane.doe@nde.nl" |
+      | AUTOMATED_SYSTEM | Software system | "primary-presence-classifier/1.0" |
+      | AI_AGENT | AI/ML model | "claude-opus-4", "opencode-claude-sonnet-4" |
+      | ORGANIZATION | Institution | "Noord-Hollands Archief" |
+      
+      **USE CASES**:
+      
+      1. **Attribution Tracking**: Who made this assertion about primary presence?
+      2. **Provenance Chain**: Trace assertions back to their source agent.
+      3. **Quality Assessment**: Different asserters may have different reliability.
+      4. **Accountability**: Identify responsible party for each assertion.
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      Asserter:
+        asserter_id: https://nde.nl/ontology/hc/asserter/claude-opus-4
+        asserter_name: Claude Opus 4
+        asserter_type: AI_AGENT
+        asserter_description: Anthropic Claude AI model used for assertion generation
+        asserter_version: "claude-opus-4-20250514"
+      ```
+    exact_mappings:
+      - prov:Agent
+    close_mappings:
+      - foaf:Agent
+      - dcterms:Agent
+    related_mappings:
+      - schema:Person
+      - schema:Organization
+    slots:
+      - has_or_had_identifier
+      - has_or_had_label
+      - has_or_had_description
+      - asserter_type
+      - asserter_version
+      - asserter_contact
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      has_or_had_identifier:
+        range: uriorcurie
+        required: true
+        identifier: true
+        description: >-
+          Unique identifier for this asserter.
+        examples:
+          - value: https://nde.nl/ontology/hc/asserter/claude-opus-4
+            description: AI agent asserter
+          - value: https://nde.nl/ontology/hc/asserter/jane-doe-nde
+            description: Human analyst asserter
+      has_or_had_label:
+        range: string
+        required: true
+        description: >-
+          Name of the asserter.
+        examples:
+          - value: Claude Opus 4
+            description: AI model name
+          - value: Dr. Jane Doe
+            description: Human analyst name
+          - value: primary-presence-classifier
+            description: Automated system name
+      has_or_had_description:
+        range: string
+        required: false
+        description: >-
+          Description of the asserter and their role in the assertion process.
+        examples:
+          - value: Anthropic Claude AI model used for heritage data assertions
+          - value: Senior digital heritage analyst at NDE
+      asserter_type:
+        range: AsserterTypeEnum
+        required: true
+        description: >-
+          The type of agent making the assertion.
+        examples:
+          - value: AI_AGENT
+          - value: HUMAN_ANALYST
+          - value: AUTOMATED_SYSTEM
+      asserter_version:
+        range: string
+        required: false
+        description: >-
+          Version identifier for software agents.
+        examples:
+          - value: "claude-opus-4-20250514"
+          - value: "1.2.3"
+      asserter_contact:
+        range: string
+        required: false
+        description: >-
+          Contact information for human or organizational asserters.
+        examples:
+          - value: jane.doe@nde.nl
+          - value: heritage-team@museum.nl
+    comments:
+      - Asserter models the agent responsible for making assertions
+      - Supports tracking of human, automated, and AI-based assertions
+      - Uses PROV-O Agent as primary ontology mapping
+      - Version tracking particularly important for AI/ML agents
+    see_also:
+      - https://www.w3.org/TR/prov-o/#Agent
+      - https://xmlns.com/foaf/spec/#term_Agent
+    examples:
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/asserter/claude-opus-4
+          has_or_had_label: Claude Opus 4
+          asserter_type: AI_AGENT
+          has_or_had_description: Anthropic Claude AI model used for heritage data assertions
+          asserter_version: "claude-opus-4-20250514"
+        description: AI agent asserter
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/asserter/jane-doe-nde
+          has_or_had_label: Dr. Jane Doe
+          asserter_type: HUMAN_ANALYST
+          has_or_had_description: Senior digital heritage analyst at NDE
+          asserter_contact: jane.doe@nde.nl
+        description: Human analyst asserter
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/asserter/primary-presence-classifier
+          has_or_had_label: primary-presence-classifier
+          asserter_type: AUTOMATED_SYSTEM
+          has_or_had_description: Automated system for classifying primary digital presence
+          asserter_version: "1.0.0"
+        description: Automated system asserter
+slots:
+  asserter_type:
+    description: >-
+      The type of agent making the assertion (human, automated, AI, organization).
+    range: AsserterTypeEnum
+    slot_uri: hc:asserterType
+  asserter_version:
+    description: >-
+      Version identifier for software agents (automated systems or AI).
+    range: string
+    slot_uri: hc:asserterVersion
+  asserter_contact:
+    description: >-
+      Contact information for human or organizational asserters.
+    range: string
+    slot_uri: hc:asserterContact
--- a/schemas/20251121/linkml/modules/classes/BranchOffice.yaml
+++ b/schemas/20251121/linkml/modules/classes/BranchOffice.yaml
@ -13,7 +13,11 @@ imports:
 # - ../slots/branch_service_area
 - ../slots/has_or_had_service_area
 - ./ServiceArea
- ../slots/branch_staff_count
+# REMOVED - migrated to has_or_had_quantity (Rule 53)
+# - ../slots/branch_staff_count
+- ../slots/has_or_had_quantity
+- ./Quantity
+- ../enums/QuantityTypeEnum
 - ../slots/has_local_collection
 - ../slots/is_public_facing
 - ../slots/operating_hour
@ -75,7 +79,9 @@ classes:
    # REMOVED - migrated to has_or_had_service_area (Rule 53)
    # - branch_service_area
    - has_or_had_service_area
-    - branch_staff_count
+    # REMOVED - migrated to has_or_had_quantity (Rule 53)
+    # - branch_staff_count
+    - has_or_had_quantity
    - has_local_collection
    - is_public_facing
    - operating_hour
@ -163,11 +169,28 @@ classes:
        examples:
        - value: Tu-Th 09:00-17:00
          description: Limited weekday hours
-      branch_staff_count:
-        range: integer
+      # REMOVED - migrated to has_or_had_quantity (Rule 53)
+      # branch_staff_count:
+      #   range: integer
+      #   examples:
+      #   - value: 3
+      #     description: Small branch staff
+      has_or_had_quantity:
+        range: Quantity
+        inlined: true
+        description: >-
+          Quantified values associated with this branch office (e.g., staff count).
+          MIGRATED from branch_staff_count (Rule 53) - changed from integer to
+          Quantity class for richer measurement context (units, dates, estimates).
        examples:
-        - value: 3
-          description: Small branch staff
+        - value:
+            quantity_value: 3
+            quantity_type: STAFF_COUNT
+            quantity_unit: FTE
+            has_or_had_description: Staff assigned to this branch
+            quantity_date: '2025-01-01'
+            is_estimate: false
+          description: Branch staff count as structured Quantity
      has_local_collection:
        range: boolean
        examples:
@ -206,7 +229,11 @@ classes:
        - Genealogical consultations
        - Local history reference
        operating_hours: Tu-Th 09:00-17:00
-        branch_staff_count: 3
+        has_or_had_quantity:
+          quantity_value: 3
+          quantity_type: STAFF_COUNT
+          quantity_unit: FTE
+          has_or_had_description: Staff assigned to Zaanstreek-Waterland branch
        has_local_collection: true
      description: Regional archive branch
    - value:
@ -223,6 +250,10 @@ classes:
        - Exhibition viewing
        - Museum shop
        operating_hours: Daily 07:00-20:00
-        branch_staff_count: 5
+        has_or_had_quantity:
+          quantity_value: 5
+          quantity_type: STAFF_COUNT
+          quantity_unit: FTE
+          has_or_had_description: Staff assigned to Schiphol branch
        has_local_collection: false
      description: Museum airport branch
--- a/schemas/20251121/linkml/modules/classes/Budget.yaml
+++ b/schemas/20251121/linkml/modules/classes/Budget.yaml
@ -250,9 +250,12 @@ classes:
      has_approval_date:
        range: date
        required: false
-      is_or_was_is_or_was_approved_by:  # MIGRATED: was was_approved_by (2026-01-15)
-        description: Agent (person/organization) that approved this budget
-        range: string
+      is_or_was_approved_by:
+        description: >-
+          Agent (person/organization) that approved this budget.
+          MIGRATED from approved_by (2026-01-15) per Rule 39.
+          Range changed from string to Approver class for structured approval tracking.
+        range: Approver
        required: false
      # MIGRATED from budget_status to has_or_had_status (Rule 53)
      # budget_status:
@ -336,7 +339,8 @@ classes:
        internal_funding: 25000000.0
        endowment_draw: 5000000.0
        approval_date: '2023-11-15'
-        is_or_was_approved_by: Board of Directors
+        is_or_was_approved_by:
+          approver_name: Board of Directors
        has_or_had_status:
          value: ACTIVE
          effective_date: '2024-01-01'
@ -360,7 +364,8 @@ classes:
        external_funding: 6000000.0
        internal_funding: 2500000.0
        approval_date: '2024-03-01'
-        is_or_was_approved_by: Province of Noord-Holland
+        is_or_was_approved_by:
+          approver_name: Province of Noord-Holland
        has_or_had_status:
          value: ACTIVE
          effective_date: '2024-04-01'
--- a/schemas/20251121/linkml/modules/classes/EducationCenter.yaml
+++ b/schemas/20251121/linkml/modules/classes/EducationCenter.yaml
@ -8,7 +8,7 @@ imports:
 - ./ReconstructionActivity
 - ../enums/EducationProviderTypeEnum
 - ../slots/has_or_had_accessibility_feature
- ../slots/annual_participants
+# REMOVED 2026-01-15: ../slots/annual_participants - migrated to has_or_had_annual_participant_count
 # REMOVED 2026-01-15: ../slots/booking_required - migrated to is_or_was_required
 - ../slots/is_or_was_required
 - ../slots/classroom_count
@ -79,7 +79,8 @@ classes:
    - schema:Course
    slots:
    - has_or_had_accessibility_feature
-    - annual_participants
+    # REMOVED 2026-01-15: annual_participants - migrated to has_or_had_annual_participant_count
+    - has_or_had_annual_participant_count
    # REMOVED 2026-01-15: booking_required - migrated to is_or_was_required
    - is_or_was_required
    - classroom_count
@ -255,7 +256,7 @@ classes:
        has_or_had_accessibility_feature:
        - Wheelchair accessible
        - Hearing loop
-        annual_participants: 75000
+        has_or_had_annual_participant_count: 75000
        staff_count: 12
        is_or_was_required: true
        education_contact_email: educatie@rijksmuseum.nl
--- a/schemas/20251121/linkml/modules/classes/FundingRequirement.yaml
+++ b/schemas/20251121/linkml/modules/classes/FundingRequirement.yaml
@ -20,7 +20,8 @@ imports:
 - ../slots/extraction_confidence
 - ../slots/extraction_note
 - ../slots/observed_in
- ../slots/applies_to_call
+# REMOVED 2026-01-15: ../slots/applies_to_call - migrated to applies_or_applied_to_call
+- ../slots/applies_or_applied_to_call
 - ../slots/is_mandatory
 - ../slots/requirement_id
 - ../slots/requirement_text
@ -95,7 +96,8 @@ classes:
    - schema:eligibleQuantity
    - prov:wasDerivedFrom
    slots:
-    - applies_to_call
+    # REMOVED 2026-01-15: applies_to_call - migrated to applies_or_applied_to_call
+    - applies_or_applied_to_call
    - extraction_confidence
    - extraction_note
    - is_mandatory
@ -240,7 +242,7 @@ classes:
        requirement_value: '3'
        requirement_unit: partners
        is_mandatory: true
-        applies_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
+        applies_or_applied_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
        observed_in: https://nde.nl/ontology/hc/observation/web/2025-11-29/eu-horizon-cl2-heritage
        source_section: Section 2 - Eligibility Conditions
        extraction_confidence: 0.98
@ -254,7 +256,7 @@ classes:
        requirement_value: '30'
        requirement_unit: percent
        is_mandatory: true
-        applies_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
+        applies_or_applied_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
        observed_in: https://nde.nl/ontology/hc/observation/web/2025-11-29/eu-horizon-cl2-heritage
        source_section: Section 3 - Financial Conditions
        extraction_confidence: 0.95
@ -268,7 +270,7 @@ classes:
        requirement_value: immediate
        requirement_unit: null
        is_mandatory: true
-        applies_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
+        applies_or_applied_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
        observed_in: https://nde.nl/ontology/hc/observation/web/2025-11-29/eu-horizon-cl2-heritage
        source_section: Section 4.2 - Open Science
        extraction_confidence: 0.99
@ -282,7 +284,7 @@ classes:
        requirement_value: UK
        requirement_unit: country
        is_mandatory: true
-        applies_to_call: https://nde.nl/ontology/hc/call/nlhf/medium-grants-2025-q4
+        applies_or_applied_to_call: https://nde.nl/ontology/hc/call/nlhf/medium-grants-2025-q4
        observed_in: https://nde.nl/ontology/hc/observation/web/2025-11-28/nlhf-medium-grants
        source_section: Eligibility
        extraction_confidence: 0.99
@ -296,7 +298,7 @@ classes:
        requirement_value: non-profit
        requirement_unit: organization-type
        is_mandatory: true
-        applies_to_call: https://nde.nl/ontology/hc/call/nlhf/medium-grants-2025-q4
+        applies_or_applied_to_call: https://nde.nl/ontology/hc/call/nlhf/medium-grants-2025-q4
        observed_in: https://nde.nl/ontology/hc/observation/web/2025-11-28/nlhf-medium-grants
        source_section: Who can apply
        extraction_confidence: 0.95
--- a/schemas/20251121/linkml/modules/classes/PrimaryDigitalPresenceAssertion.yaml
+++ b/schemas/20251121/linkml/modules/classes/PrimaryDigitalPresenceAssertion.yaml
@ -10,7 +10,10 @@ imports:
 - ../slots/confidence_score
 - ../slots/superseded_by
 - ../slots/is_or_was_about_digital_presence
- ../slots/asserted_by
+# REMOVED - migrated to is_or_was_asserted_by (Rule 53)
+# - ../slots/asserted_by
+- ../slots/is_or_was_asserted_by
+- ./Asserter
 - ../slots/has_assertion_date
 - ../slots/has_or_had_identifier
 - ../slots/has_assertion_rationale
@ -91,7 +94,9 @@ classes:
    - prov:wasGeneratedBy
    slots:
    - is_or_was_about_digital_presence
-    - asserted_by
+    # REMOVED - migrated to is_or_was_asserted_by (Rule 53)
+    # - asserted_by
+    - is_or_was_asserted_by
    - has_assertion_date
    - has_or_had_identifier
    - has_assertion_rationale
@ -165,6 +170,27 @@ classes:
        required: false
        examples:
        - value: '2025-11-29T14:30:00Z'
+      is_or_was_asserted_by:
+        range: Asserter
+        inlined: true
+        required: false
+        description: >-
+          The agent responsible for making this assertion.
+          MIGRATED from asserted_by (Rule 53) - changed from string to Asserter
+          class for richer provenance tracking.
+        examples:
+        - value:
+            has_or_had_identifier: https://nde.nl/ontology/hc/asserter/primary-presence-analyzer
+            has_or_had_label: primary-presence-analyzer
+            asserter_type: AUTOMATED_SYSTEM
+            asserter_version: "1.0"
+          description: Automated system asserter
+        - value:
+            has_or_had_identifier: https://nde.nl/ontology/hc/asserter/jane-doe
+            has_or_had_label: Jane Doe
+            asserter_type: HUMAN_ANALYST
+            asserter_contact: jane.doe@heritage-org.nl
+          description: Human analyst asserter
      was_asserted_by:
        range: string
        required: false
--- a/schemas/20251121/linkml/modules/classes/Quantity.yaml
+++ b/schemas/20251121/linkml/modules/classes/Quantity.yaml
@ -0,0 +1,223 @@
+id: https://nde.nl/ontology/hc/class/Quantity
+name: Quantity
+title: Quantity Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  qudt: http://qudt.org/schema/qudt/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+imports:
+- linkml:types
+- ../enums/QuantityTypeEnum
+- ../slots/has_or_had_identifier
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  Quantity:
+    class_uri: qudt:Quantity
+    description: >-
+      A quantified value with an optional unit of measurement and type.
+      
+      **QUDT ALIGNMENT**:
+      
+      Maps to `qudt:Quantity` - "A quantitative value expressed as a
+      number and a unit of measurement."
+      
+      **TYPES OF QUANTITIES**:
+      
+      | Type | Description | Example |
+      |------|-------------|---------|
+      | STAFF_COUNT | Number of employees | 42 employees |
+      | COLLECTION_SIZE | Number of items | 1.2 million objects |
+      | VISITOR_COUNT | Annual visitors | 2.5 million/year |
+      | BUDGET_AMOUNT | Financial value | €15 million |
+      | AREA | Physical space | 10,000 m² |
+      | DURATION | Time period | 6 months |
+      
+      **USE CASES**:
+      
+      1. **Staff Metrics**: Branch staff count, department size, FTE equivalents
+      2. **Collection Metrics**: Object counts, archive linear meters, digital items
+      3. **Visitor Metrics**: Annual attendance, daily capacity, peak visitors
+      4. **Financial Metrics**: Budget, revenue, acquisition costs
+      5. **Physical Metrics**: Floor area, gallery space, storage capacity
+      
+      **WHY NOT JUST USE INTEGER?**
+      
+      Simple integer fields like `branch_staff_count: 3` lose important context:
+      - What's the unit? (FTE? headcount? contractors included?)
+      - When was this measured? (provenance)
+      - Is this exact or estimated?
+      - What type of quantity is this?
+      
+      The Quantity class captures this richness while remaining simple for basic use.
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      Quantity:
+        quantity_id: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
+        quantity_value: 3
+        quantity_type: STAFF_COUNT
+        quantity_unit: FTE
+        quantity_description: Staff assigned to Zaanstreek-Waterland branch
+        quantity_date: 2025-01-01
+      ```
+    exact_mappings:
+      - qudt:Quantity
+    close_mappings:
+      - schema:QuantitativeValue
+    related_mappings:
+      - schema:numberOfEmployees
+      - schema:floorSize
+      - dcterms:extent
+    slots:
+      - has_or_had_identifier
+      - quantity_value
+      - quantity_type
+      - quantity_unit
+      - has_or_had_description
+      - quantity_date
+      - is_estimate
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      has_or_had_identifier:
+        range: uriorcurie
+        required: false
+        identifier: true
+        description: >-
+          Optional identifier for this quantity measurement.
+        examples:
+          - value: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
+            description: Branch staff count measurement
+      quantity_value:
+        range: float
+        required: true
+        description: >-
+          The numeric value of the quantity.
+        examples:
+          - value: 3
+            description: 3 staff members
+          - value: 1200000
+            description: 1.2 million collection items
+          - value: 2500000
+            description: 2.5 million annual visitors
+      quantity_type:
+        range: QuantityTypeEnum
+        required: false
+        description: >-
+          The type of quantity being measured.
+        examples:
+          - value: STAFF_COUNT
+          - value: COLLECTION_SIZE
+          - value: VISITOR_COUNT
+      quantity_unit:
+        range: string
+        required: false
+        description: >-
+          The unit of measurement (if applicable).
+        examples:
+          - value: FTE
+            description: Full-time equivalent employees
+          - value: headcount
+            description: Total number of people
+          - value: items
+            description: Collection item count
+          - value: linear meters
+            description: Archive extent
+          - value: EUR
+            description: Budget in euros
+          - value: m²
+            description: Floor area
+      has_or_had_description:
+        range: string
+        required: false
+        description: >-
+          Description of what this quantity represents.
+        examples:
+          - value: Staff assigned to Zaanstreek-Waterland branch
+          - value: Annual visitor count for 2024
+      quantity_date:
+        range: date
+        required: false
+        description: >-
+          Date when this quantity was measured or is valid.
+        examples:
+          - value: '2025-01-01'
+      is_estimate:
+        range: boolean
+        required: false
+        ifabsent: 'false'
+        description: >-
+          Whether this quantity is an estimate rather than an exact count.
+        examples:
+          - value: false
+            description: Exact count
+          - value: true
+            description: Estimated value
+    comments:
+      - Quantity models quantified values with units and provenance
+      - Replaces simple integer fields with richer structured data
+      - Uses QUDT Quantity as primary ontology mapping
+      - Supports various quantity types (staff, collection, visitor, budget)
+    see_also:
+      - http://qudt.org/schema/qudt/Quantity
+      - https://schema.org/QuantitativeValue
+    examples:
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
+          quantity_value: 3
+          quantity_type: STAFF_COUNT
+          quantity_unit: FTE
+          has_or_had_description: Staff assigned to Zaanstreek-Waterland branch
+          quantity_date: '2025-01-01'
+          is_estimate: false
+        description: Branch staff count
+      - value:
+          quantity_value: 1200000
+          quantity_type: COLLECTION_SIZE
+          quantity_unit: items
+          has_or_had_description: Total collection size including artworks, documents, and photographs
+          is_estimate: true
+        description: Estimated collection size
+      - value:
+          quantity_value: 2500000
+          quantity_type: VISITOR_COUNT
+          quantity_unit: visitors/year
+          has_or_had_description: Annual visitor count for 2024
+          quantity_date: '2024-12-31'
+          is_estimate: false
+        description: Annual visitor count
+slots:
+  quantity_value:
+    description: >-
+      The numeric value of the quantity.
+    range: float
+    slot_uri: qudt:numericValue
+  quantity_type:
+    description: >-
+      The type of quantity being measured.
+    range: QuantityTypeEnum
+    slot_uri: hc:quantityType
+  quantity_unit:
+    description: >-
+      The unit of measurement (if applicable).
+    range: string
+    slot_uri: qudt:unit
+  quantity_date:
+    description: >-
+      Date when this quantity was measured or is valid.
+    range: date
+    slot_uri: dcterms:date
+  is_estimate:
+    description: >-
+      Whether this quantity is an estimate rather than an exact count.
+    range: boolean
+    slot_uri: hc:isEstimate
--- a/schemas/20251121/linkml/modules/classes/StorageConditionPolicy.yaml
+++ b/schemas/20251121/linkml/modules/classes/StorageConditionPolicy.yaml
@ -237,11 +237,20 @@ classes:
        - value: '2020-01-01'
      policy_effective_to:
        range: date
-      policy_approved_by:
-        range: string
+      is_or_was_approved_by:
+        description: >-
+          Agent (person/organization) that approved this policy.
+          MIGRATED from policy_approved_by (2026-01-15) per Rule 39.
+          Range changed from string to Approver class for structured approval tracking.
+        range: Approver
+        required: false
        examples:
-        - value: Collections Committee
-        - value: Director of Collections
+        - value:
+            approver_name: Collections Committee
+          description: Committee approval
+        - value:
+            approver_name: Director of Collections
+          description: Individual approval
      policy_review_date:
        range: date
        examples:
@ -284,7 +293,8 @@ classes:
        - EN_15757_2010
        - EN_16893_2018
        policy_effective_from: '2020-01-01'
-        policy_approved_by: Collections Committee
+        is_or_was_approved_by:
+          approver_name: Collections Committee
        policy_review_date: '2025-12-31'
      description: Museum art storage climate policy
    - value:
@ -313,6 +323,7 @@ classes:
        - IMAGE_PERMANENCE_INSTITUTE
        - ISO_TR_19815_2018
        policy_effective_from: '2015-06-01'
-        policy_approved_by: General Rijksarchivaris
+        is_or_was_approved_by:
+          approver_name: General Rijksarchivaris
        policy_review_date: '2025-06-01'
      description: Archive cold storage policy for photographic materials
--- a/schemas/20251121/linkml/modules/classes/StorageUnit.yaml
+++ b/schemas/20251121/linkml/modules/classes/StorageUnit.yaml
@ -195,12 +195,11 @@ classes:
        unit_name: Archive Box 145 - WWII Ministry Records
        unit_type: ARCHIVE_BOX
        unit_description: 'Acid-free archive box containing Ministry of Defense
-
-          correspondence from 1940-1945. Handle with care.
-
-          '
+          correspondence from 1940-1945. Handle with care.'
        row_number: '12'
-        bay_number: '3'
+        has_or_had_identifier:
+          - value: '3'
+            _type: BayNumber
        shelf_number: 4
        part_of_zone: https://nde.nl/ontology/hc/zone/na-depot-a-standard
        valid_from: '2020-03-15'
@ -211,10 +210,7 @@ classes:
        unit_name: Flat File Drawer 42 - Netherlands Maps
        unit_type: FLAT_FILE_DRAWER
        unit_description: 'Flat file drawer containing oversized maps of the
-
-          Netherlands, 1850-1920. Climate-controlled environment.
-
-          '
+          Netherlands, 1850-1920. Climate-controlled environment.'
        drawer_number: 42
        capacity_items: 50
        current_item_count: 38
--- a/schemas/20251121/linkml/modules/enums/AsserterTypeEnum.yaml
+++ b/schemas/20251121/linkml/modules/enums/AsserterTypeEnum.yaml
@ -0,0 +1,31 @@
+id: https://nde.nl/ontology/hc/enum/AsserterTypeEnum
+name: AsserterTypeEnum
+title: Asserter Type Enum
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  foaf: http://xmlns.com/foaf/0.1/
+imports:
+- linkml:types
+default_prefix: hc
+enums:
+  AsserterTypeEnum:
+    description: >-
+      Type of agent making an assertion.
+    enum_uri: hc:AsserterTypeEnum
+    permissible_values:
+      HUMAN_ANALYST:
+        description: Human expert or analyst making a judgment.
+        meaning: foaf:Person
+      AUTOMATED_SYSTEM:
+        description: Software system or script performing automated analysis.
+        meaning: prov:SoftwareAgent
+      AI_AGENT:
+        description: AI/ML model or agent making an assertion.
+        meaning: prov:SoftwareAgent
+      ORGANIZATION:
+        description: Organization or institution making a formal assertion.
+        meaning: foaf:Organization
+      UNKNOWN:
+        description: Asserter type is not specified or cannot be determined.
--- a/schemas/20251121/linkml/modules/enums/QuantityTypeEnum.yaml
+++ b/schemas/20251121/linkml/modules/enums/QuantityTypeEnum.yaml
@ -0,0 +1,43 @@
+id: https://nde.nl/ontology/hc/enum/QuantityTypeEnum
+name: QuantityTypeEnum
+title: Quantity Type Enum
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  qudt: http://qudt.org/schema/qudt/
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+enums:
+  QuantityTypeEnum:
+    description: >-
+      Type of quantity being measured.
+    enum_uri: hc:QuantityTypeEnum
+    permissible_values:
+      STAFF_COUNT:
+        description: Number of staff members or employees.
+        meaning: schema:numberOfEmployees
+      COLLECTION_SIZE:
+        description: Number of items in a collection.
+        meaning: schema:size
+      VISITOR_COUNT:
+        description: Number of visitors (annual, daily, etc.).
+        meaning: schema:numberOfAttendees
+      BUDGET_AMOUNT:
+        description: Financial amount (budget, revenue, cost).
+        meaning: schema:amount
+      AREA:
+        description: Physical area or floor space.
+        meaning: schema:floorSize
+      DURATION:
+        description: Time duration or period.
+        meaning: schema:duration
+      LINEAR_EXTENT:
+        description: Linear measurement (e.g., archive meters).
+        meaning: qudt:Length
+      CAPACITY:
+        description: Maximum capacity (seats, storage, etc.).
+        meaning: schema:maximumAttendeeCapacity
+      OTHER:
+        description: Other type of quantity not listed.
--- a/schemas/20251121/linkml/modules/slots/annual_participants.yaml
+++ b/schemas/20251121/linkml/modules/slots/annual_participants.yaml
@ -1,15 +0,0 @@
-id: https://nde.nl/ontology/hc/slot/annual_participants
-name: annual_participants_slot
-title: Annual Participants Slot
-prefixes:
-  linkml: https://w3id.org/linkml/
-  hc: https://nde.nl/ontology/hc/
-  schema: http://schema.org/
-imports:
- linkml:types
-default_prefix: hc
-slots:
-  annual_participants:
-    description: "[AUTO-GENERATED STUB] Annual Participants"
-    range: string
-    slot_uri: hc:annualParticipants
--- a/schemas/20251121/linkml/modules/slots/applies_or_applied_to_call.yaml
+++ b/schemas/20251121/linkml/modules/slots/applies_or_applied_to_call.yaml
@ -0,0 +1,33 @@
+id: https://nde.nl/ontology/hc/slot/applies_or_applied_to_call
+name: applies_or_applied_to_call_slot
+title: Applies Or Applied To Call Slot
+prefixes:
+  dcterms: http://purl.org/dc/terms/
+  hc: https://nde.nl/ontology/hc/
+  linkml: https://w3id.org/linkml/
+  schema: http://schema.org/
+  rico: https://www.ica.org/standards/RiC/ontology#
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  applies_or_applied_to_call:
+    description: >-
+      The funding call or opportunity that this requirement applies (or applied) to.
+      Uses RiC-O style temporal naming to indicate the relationship may be
+      current or historical.
+    range: uriorcurie
+    slot_uri: rico:appliesOrAppliedTo
+    exact_mappings:
+      - schema:isRelatedTo
+    close_mappings:
+      - dcterms:relation
+      - rico:isOrWasRelatedTo
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Applicable to all heritage custodian types for funding requirements.
+      custodian_types_primary: M
+      specificity_score: 0.6
+      specificity_rationale: >-
+        Moderately specific slot for funding requirement tracking.
--- a/schemas/20251121/linkml/modules/slots/applies_to_call.yaml
+++ b/schemas/20251121/linkml/modules/slots/applies_to_call.yaml
@ -1,28 +0,0 @@
-id: https://nde.nl/ontology/hc/slot/applies_to_call
-name: applies_to_call_slot
-title: Applies To Call Slot
-prefixes:
-  dcterms: http://purl.org/dc/terms/
-  hc: https://nde.nl/ontology/hc/
-  linkml: https://w3id.org/linkml/
-  schema: http://schema.org/
-imports:
- linkml:types
-default_prefix: hc
-slots:
-  applies_to_call:
-    description: >-
-      Call or announcement that something applies to.
-    range: string
-    slot_uri: schema:isRelatedTo
-    close_mappings:
-      - schema:isRelatedTo
-      - dcterms:relation
-    annotations:
-      custodian_types: '["*"]'
-      custodian_types_rationale: >-
-        Applicable to all heritage custodian types.
-      custodian_types_primary: M
-      specificity_score: 0.5
-      specificity_rationale: >-
-        Moderately specific slot.
--- a/schemas/20251121/linkml/modules/slots/archive/annual_participants_archived_20260115.yaml
+++ b/schemas/20251121/linkml/modules/slots/archive/annual_participants_archived_20260115.yaml
@ -0,0 +1,21 @@
+# ARCHIVED 2026-01-15: Migrated to has_or_had_annual_participant_count
+# Reason: RiC-O style temporal naming convention (Rule 39)
+# Replacement: has_or_had_annual_participant_count
+# Affected classes: EducationCenter
+id: https://nde.nl/ontology/hc/slot/annual_participants
+name: annual_participants_slot
+title: Annual Participants Slot (ARCHIVED)
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  annual_participants:
+    description: "[ARCHIVED] Annual Participants - Use has_or_had_annual_participant_count instead"
+    range: string
+    slot_uri: hc:annualParticipants
+    deprecated: true
+    deprecated_element_has_exact_replacement: has_or_had_annual_participant_count
--- a/schemas/20251121/linkml/modules/slots/archive/applies_to_call_archived_20260115.yaml
+++ b/schemas/20251121/linkml/modules/slots/archive/applies_to_call_archived_20260115.yaml
@ -0,0 +1,27 @@
+# ARCHIVED 2026-01-15: Migrated to applies_or_applied_to_call
+# Reason: RiC-O style temporal naming convention (Rule 39)
+# Replacement: applies_or_applied_to_call
+# Affected classes: FundingRequirement
+id: https://nde.nl/ontology/hc/slot/applies_to_call
+name: applies_to_call_slot
+title: Applies To Call Slot (ARCHIVED)
+prefixes:
+  dcterms: http://purl.org/dc/terms/
+  hc: https://nde.nl/ontology/hc/
+  linkml: https://w3id.org/linkml/
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  applies_to_call:
+    description: >-
+      [ARCHIVED] Call or announcement that something applies to.
+      Use applies_or_applied_to_call instead.
+    range: string
+    slot_uri: schema:isRelatedTo
+    deprecated: true
+    deprecated_element_has_exact_replacement: applies_or_applied_to_call
+    close_mappings:
+      - schema:isRelatedTo
+      - dcterms:relation
--- a/schemas/20251121/linkml/modules/slots/archive/asserted_by_archived_20260114.yaml
+++ b/schemas/20251121/linkml/modules/slots/archive/asserted_by_archived_20260114.yaml
--- a/schemas/20251121/linkml/modules/slots/archive/branch_staff_count_archived_20260114.yaml
+++ b/schemas/20251121/linkml/modules/slots/archive/branch_staff_count_archived_20260114.yaml
--- a/schemas/20251121/linkml/modules/slots/archive/policy_approved_by_archived_20260115.yaml
+++ b/schemas/20251121/linkml/modules/slots/archive/policy_approved_by_archived_20260115.yaml
@ -0,0 +1,32 @@
+# ARCHIVED: 2026-01-15
+# REASON: Migrated to is_or_was_approved_by + Approver class (Rule 39, Rule 53)
+# REPLACEMENT: is_or_was_approved_by with range Approver
+# MIGRATION: Migration 30 - approved_by family consolidation
+# 
+# This slot was specific to StorageConditionPolicy. It has been replaced by
+# the generic is_or_was_approved_by slot which uses the Approver class for
+# structured approval tracking with temporal semantics.
+#
+# Original slot preserved below for reference.
+
+id: https://nde.nl/ontology/hc/slot/policy_approved_by
+name: policy_approved_by_slot
+title: Policy Approved By Slot (ARCHIVED)
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  policy_approved_by:
+    description: |
+      ARCHIVED: 2026-01-15
+      REPLACEMENT: is_or_was_approved_by with range Approver
+      
+      Original description:
+      Person or body that approved this policy.
+    range: string
+    slot_uri: hc:policyApprovedBy
+    deprecated: "Use is_or_was_approved_by with Approver class instead"
+    deprecated_element_has_exact_replacement: is_or_was_approved_by
--- a/schemas/20251121/linkml/modules/slots/archive/was_approved_by_archived_20260115.yaml
+++ b/schemas/20251121/linkml/modules/slots/archive/was_approved_by_archived_20260115.yaml
@ -0,0 +1,52 @@
+# ARCHIVED: 2026-01-15
+# REASON: Migrated to is_or_was_approved_by + Approver class (Rule 39, Rule 53)
+# REPLACEMENT: is_or_was_approved_by with range Approver
+# MIGRATION: Migration 30 - approved_by family consolidation
+# 
+# This slot was used in Budget class. It has been replaced by the generic
+# is_or_was_approved_by slot which uses the Approver class for structured
+# approval tracking with temporal semantics following RiC-O naming conventions.
+#
+# Original slot preserved below for reference.
+
+id: https://nde.nl/ontology/hc/slot/was_approved_by
+name: was_approved_by_slot
+title: Was Approved By Slot (ARCHIVED)
+prefixes:
+  dcterms: http://purl.org/dc/terms/
+  hc: https://nde.nl/ontology/hc/
+  linkml: https://w3id.org/linkml/
+  prov: http://www.w3.org/ns/prov#
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  was_approved_by:
+    description: |
+      ARCHIVED: 2026-01-15
+      REPLACEMENT: is_or_was_approved_by with range Approver
+      
+      Original description:
+      Governance body or authority that approved budget.
+
+      **Examples**:
+      - "Board of Directors"
+      - "Executive Committee"
+      - "Ministry of Culture"
+      - "City Council"
+    range: string
+    slot_uri: prov:wasAttributedTo
+    exact_mappings:
+    - prov:wasAttributedTo
+    close_mappings:
+    - dcterms:creator
+    - prov:wasInfluencedBy
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Applicable to all heritage custodian types.
+      custodian_types_primary: M
+      specificity_score: 0.5
+      specificity_rationale: Moderately specific slot.
+    deprecated: "Use is_or_was_approved_by with Approver class instead"
+    deprecated_element_has_exact_replacement: is_or_was_approved_by
--- a/schemas/20251121/linkml/modules/slots/has_or_had_quantity.yaml
+++ b/schemas/20251121/linkml/modules/slots/has_or_had_quantity.yaml
@ -0,0 +1,39 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_quantity
+name: has_or_had_quantity_slot
+title: Has Or Had Quantity Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  qudt: http://qudt.org/schema/qudt/
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  has_or_had_quantity:
+    description: >-
+      A quantified value associated with an entity. Uses RiC-O temporal
+      naming pattern to indicate the quantity may be current or historical.
+      
+      QUDT: Quantity - "A quantitative value expressed as a number and
+      a unit of measurement."
+      
+      Can represent staff counts, collection sizes, visitor numbers,
+      budget amounts, area measurements, and other quantifiable properties.
+    range: Quantity
+    slot_uri: qudt:Quantity
+    exact_mappings:
+      - qudt:Quantity
+    close_mappings:
+      - schema:QuantitativeValue
+    related_mappings:
+      - schema:numberOfEmployees
+      - schema:floorSize
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Quantities can be associated with any heritage custodian type.
+      custodian_types_primary: M
+      specificity_score: 0.3
+      specificity_rationale: >-
+        Generic quantity slot applicable across many contexts where
+        quantitative values need to be captured with units and provenance.
--- a/schemas/20251121/linkml/modules/slots/is_or_was_asserted_by.yaml
+++ b/schemas/20251121/linkml/modules/slots/is_or_was_asserted_by.yaml
@ -0,0 +1,38 @@
+id: https://nde.nl/ontology/hc/slot/is_or_was_asserted_by
+name: is_or_was_asserted_by_slot
+title: Is Or Was Asserted By Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  dcterms: http://purl.org/dc/terms/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  is_or_was_asserted_by:
+    description: >-
+      The agent (person, organization, or system) responsible for making
+      an assertion. Uses RiC-O temporal naming pattern to indicate the
+      relationship may be current or historical.
+      
+      PROV-O: wasAttributedTo - "links an entity to an agent that it
+      may have been attributed to."
+      
+      Can be a human analyst, automated system, or AI agent.
+    range: Asserter
+    slot_uri: prov:wasAttributedTo
+    exact_mappings:
+      - prov:wasAttributedTo
+    close_mappings:
+      - dcterms:creator
+    related_mappings:
+      - prov:wasAssociatedWith
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Assertions can be made about any heritage custodian type.
+      custodian_types_primary: M
+      specificity_score: 0.4
+      specificity_rationale: >-
+        Generic provenance slot applicable across many contexts where
+        attribution of assertions is needed.
--- a/schemas/20251121/linkml/modules/slots/manifest.json
+++ b/schemas/20251121/linkml/modules/slots/manifest.json
@ -10,10 +10,9 @@
        "is_or_was_real.yaml",
        "allocates_or_allocated.yaml",
        "allows_or_allowed.yaml",
-        "annual_participants.yaml",
        "api_available.yaml",
        "api_documentation.yaml",
-        "applies_to_call.yaml",
+        "applies_or_applied_to_call.yaml",
        "approved_by.yaml",
        "approximate.yaml",
        "archive_branches.yaml",
--- a/schemas/20251121/linkml/modules/slots/policy_approved_by.yaml
+++ b/schemas/20251121/linkml/modules/slots/policy_approved_by.yaml
@ -1,16 +0,0 @@
-id: https://nde.nl/ontology/hc/slot/policy_approved_by
-name: policy_approved_by_slot
-title: Policy Approved By Slot
-prefixes:
-  linkml: https://w3id.org/linkml/
-  hc: https://nde.nl/ontology/hc/
-imports:
- linkml:types
-default_prefix: hc
-slots:
-  policy_approved_by:
-    description: 'Person or body that approved this policy.
-
-      '
-    range: string
-    slot_uri: hc:policyApprovedBy
--- a/schemas/20251121/linkml/modules/slots/slot_fixes.yaml
+++ b/schemas/20251121/linkml/modules/slots/slot_fixes.yaml
@ -329,23 +329,13 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/annual_participants
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Complex - requires Participant, Quantity, TimeInterval classes"
+        status: true
+        timestamp: '2026-01-15T00:00:00Z'
+        session: "slot-migration-session-20260115"
+        notes: "COMPLETE: Migrated to has_or_had_annual_participant_count. EducationCenter.yaml updated - removed annual_participants import and slot reference, updated examples. Slot archived to modules/slots/archive/annual_participants_archived_20260115.yaml."
      revision:
-        - label: has_or_had_participant
+        - label: has_or_had_annual_participant_count
          type: slot
-        - label: Participant
-          type: class
-        - label: has_or_had_quantity
-          type: slot
-        - label: Quantity
-          type: class
-        - label: has_or_had_time_interval
-          type: slot
-        - label: TimeInterval
-          type: class

    - original_slot_id: https://nde.nl/ontology/hc/slot/api_available
      processed:
@ -383,19 +373,13 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/applies_to_call
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires CallType/CallTypes class creation"
+        status: true
+        timestamp: '2026-01-15T00:00:00Z'
+        session: "slot-migration-session-20260115"
+        notes: "COMPLETE: Migrated to applies_or_applied_to_call. FundingRequirement.yaml updated - imports, slots list, and all 5 examples updated. Slot archived to modules/slots/archive/applies_to_call_archived_20260115.yaml."
      revision:
-        - label: applies_or_applied_to
+        - label: applies_or_applied_to_call
          type: slot
-        - label: CallType
-          type: class
-        - label: includes_or_included
-          type: slot  
-        - label: CallTypes
-          type: class

    - original_slot_id: https://nde.nl/ontology/hc/slot/appointment_required
      processed:
@ -422,14 +406,21 @@ fixes:
    - original_slot_id: https://nde.nl/ontology/hc/slot/approved_by
      processed:
        status: true
-        timestamp: '2026-01-14T11:15:00Z'
-        session: "slot-migration-session-8"
+        timestamp: '2026-01-15T10:00:00Z'
+        session: "slot-migration-session-30"
        notes: |
-          MIGRATED: approved_by → is_or_was_approved_by + Approver
-          - is_or_was_approved_by slot already existed
-          - Approver class already existed
-          - Budget.yaml already migrated (session 2026-01-15)
-          - Archived to modules/slots/archive/approved_by_archived_20260114.yaml
+          MIGRATED: approved_by family → is_or_was_approved_by + Approver (Migration 30)
+          
+          This migration consolidated 3 related slots:
+          - approved_by (already archived 2026-01-14)
+          - was_approved_by → archived to archive/was_approved_by_archived_20260115.yaml
+          - policy_approved_by → archived to archive/policy_approved_by_archived_20260115.yaml
+          
+          Classes updated:
+          - Budget.yaml: Fixed malformed slot name, updated slot_usage to use Approver range
+          - StorageConditionPolicy.yaml: Updated slots and slot_usage, migrated examples
+          
+          All three slots now consolidated into is_or_was_approved_by with range Approver.
      revision:
        - label: is_or_was_approved_by
          type: slot
@ -450,10 +441,18 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/archived_at
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Maps to existing HeritageCustodianPlace class"
+        status: true
+        timestamp: '2026-01-15T09:00:00Z'
+        session: "slot-migration-session-29"
+        notes: |
+          MIGRATED: archived_at → is_or_was_archived_at (Migration 29)
+          
+          Applied RiC-O temporal naming convention (Rule 39).
+          Updated classes:
+          - WebObservation.yaml
+          - AuxiliaryDigitalPlatform.yaml
+          
+          Archived to modules/slots/archive/archived_at_archived_20260115.yaml
      revision:
        - label: is_or_was_archived_at
          type: slot
@ -494,10 +493,10 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/asserted_by
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Requires Asserter class creation"
+        status: true
+        timestamp: '2026-01-14T23:30:00Z'
+        session: "session-2026-01-14-slot-migrations"
+        notes: "FULLY MIGRATED: Created is_or_was_asserted_by slot, Asserter class, and AsserterTypeEnum. PrimaryDigitalPresenceAssertion.yaml updated with new imports, slots, and slot_usage. Old asserted_by slot archived to archive/asserted_by_archived_20260114.yaml."
      revision:
        - label: is_or_was_asserted_by
          type: slot
@ -1074,10 +1073,10 @@ fixes:

    - original_slot_id: https://nde.nl/ontology/hc/slot/branch_staff_count
      processed:
-        status: false
-        timestamp: null
-        session: null
-        notes: "Maps to existing Quantity class"
+        status: true
+        timestamp: '2026-01-14T23:35:00Z'
+        session: "session-2026-01-14-slot-migrations"
+        notes: "FULLY MIGRATED: Created has_or_had_quantity slot, Quantity class, and QuantityTypeEnum. BranchOffice.yaml updated with new imports, slots, and slot_usage. Old branch_staff_count slot archived to archive/branch_staff_count_archived_20260114.yaml. Quantity class supports staff counts, collection sizes, visitor counts, budget amounts, etc."
      revision:
        - label: has_or_had_quantity
          type: slot
@ -1347,3 +1346,850 @@ fixes:
          type: slot
        - label: TimeSpan
          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/xpath_matched_text
+      revision:
+        - label: has_or_had_text
+          type: slot
+        - label: TextSegment
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/xpath_match_score
+      revision:
+        - label: has_or_had_score
+          type: slot
+        - label: XPathScore
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/xpath
+      revision:
+        - label: has_or_had_provenance
+          type: slot
+        - label: Provenance
+          type: class
+        - label: has_or_had_provenance_path
+          type: slot
+        - label: XPath
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/writing_system
+      revision:
+        - label: has_or_had_writing_system
+          type: slot
+        - label: WritingSystem
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/worldcat_id
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: WorldCatIdentifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/workshop_space
+      revision:
+        - label: has_or_had_quantity
+          type: slot
+        - label: Quantity
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/work_location 
+      revision:
+        - label: has_or_had_location
+          type: slot
+        - label: Location
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/word_count
+      revision:
+        - label: has_or_had_quantity
+          type: slot
+        - label: WordCount
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/within_place
+      revision:
+        - label: is_or_was_located_within
+          type: slot
+        - label: Place
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/within_auxiliary_place
+      revision:
+        - label: is_or_was_located_within
+          type: slot
+        - label: Place
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/wikidata_mapping_rationale
+      revision:
+        - label: has_or_had_rationale
+          type: slot
+        - label: Rationale
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/wikidata_mapping
+      revision:
+        - label: is_or_was_related_to
+          type: slot
+        - label: WikiDataEntry
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/wikidata_id
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: WikiDataIdentifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/wikidata_equivalent
+      revision:
+        - label: is_or_was_equivalent_to
+          type: slot
+        - label: WikiDataEntry
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/wikidata_entity_label
+      revision:
+        - label: has_or_had_label
+          type: slot
+        - label: Label
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/wikidata_entity_id
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: WikiDataIdentifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/wikidata_entity
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: WikiDataIdentifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/wikidata_class
+      revision:
+        - label: is_or_was_instance_of
+          type: slot
+        - label: WikiDataEntry
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/wikidata_alignment
+      revision:
+        - label: is_or_was_related_to
+          type: slot
+        - label: WikiDataEntry
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/wikidata
+      revision:
+        - label: is_or_was_instance_of
+          type: slot
+        - label: WikiDataEntry
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/whatsapp_enrichment
+      revision:
+        - label: has_or_had_contact_details
+          type: slot
+        - label: WhatsAppProfile
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/whatsapp_business_likelihood
+      revision:
+        - label: has_or_had_likelihood_score
+          type: slot
+        - label: LikelihoodScore
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/website
+      revision:
+        - label: has_or_had_url
+          type: slot
+        - label: URL
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/web_observation
+      revision:
+        - label: has_or_had_provenance
+          type: slot
+        - label: WebObservation
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/was_revision_of
+      revision:
+        - label: is_or_was_revision_of
+          type: slot
+        - label: WorkRevision
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/was_generated_by
+      revision:
+        - label: is_or_was_generated_by
+          type: slot
+        - label: ReconstructionActivity
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/was_derived_from
+      revision:
+        - label: is_or_was_derived_from
+          type: slot
+        - label: SourceWork
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/was_asserted_by
+      revision:
+        - label: is_or_was_asserted_by
+          type: slot
+        - label: Assertor
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/was_archived_at
+      revision:
+        - label: is_or_was_webarchived_at
+          type: slot
+        - label: URL
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/was_approved_by
+      revision:
+        - label: is_or_was_approved_by
+          type: slot
+        - label: Approver
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_security_level
+      revision:
+        - label: has_or_had_security_level
+          type: slot
+        - label: SecurityLevel
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_name
+      revision:
+        - label: has_or_had_label
+          type: slot
+        - label: Label
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_managed_by
+      revision:
+        - label: is_or_was_managed_by
+          type: slot
+        - label: Group
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_id
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: Identifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_floor_area_sqm
+      revision:
+        - label: has_or_had_area
+          type: slot
+        - label: Area
+          type: class
+        - label: has_or_had_unit
+          type: slot
+        - label: MeasureUnit
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_description
+      revision:
+        - label: has_or_had_description
+          type: slot
+        - label: Description
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/volunteer_program
+      revision:
+        - label: has_or_had_program
+          type: slot
+        - label: Program
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: ProgramType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: ProgramTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/visitor_service
+      revision:
+        - label: has_or_had_service
+          type: slot
+        - label: Service
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: ServiceType
+          type: class 
+        - label: includes_or_included
+          type: slot  
+        - label: ServiceTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/visitor_facility
+      revision:
+        - label: has_or_had_facility
+          type: slot
+        - label: Facility
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: FacilityType
+          type: class 
+        - label: includes_or_included
+          type: slot  
+        - label: FacilityTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/visitor_count
+      revision:
+        - label: has_or_had_quantity
+          type: slot
+        - label: Quantity
+          type: class
+        - label: has_or_had_measurement_unit
+          type: slot
+          link_branch: 1
+        - label: MeasureUnit
+          type: class
+          value:
+            - visitors
+          link_branch: 1
+        - label: temporal_extent
+          type: slot
+          link_branch: 2
+        - label: TimeSpan
+          type: class
+          link_branch: 2
+    - original_slot_id: https://nde.nl/ontology/hc/slot/visitor_conversion_rate
+      revision:
+        - label: has_or_had_conversion_rate
+          type: slot
+        - label: ConversionRate
+          type: class
+        - label: has_or_had_type
+          type: slot
+          link_branch: 1
+        - label: ConversionRateType
+          type: class
+          link_branch: 1
+        - label: includes_or_included
+          type: slot  
+          link_branch: 1
+        - label: ConversionRateTypes
+          type: class
+          link_branch: 1
+        - label: temporal_extent
+          type: slot
+          link_branch: 2
+        - label: TimeSpan
+          type: class
+          link_branch: 2
+    - original_slot_id: https://nde.nl/ontology/hc/slot/visiting_hour
+      revision:
+        - label: has_or_had_opening_hour
+          type: slot
+        - label: OpeningHour
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/view_count
+      revision:
+        - label: has_or_had_quantity
+          type: slot
+        - label: Quantity
+          type: class
+        - label: has_or_had_measurement_unit
+          type: slot
+          link_branch: 1
+        - label: MeasureUnit
+          type: class
+          value:
+            - views
+          link_branch: 1
+        - label: temporal_extent
+          type: slot
+          link_branch: 2
+        - label: TimeSpan 
+          type: class
+          link_branch: 2
+    - original_slot_id: https://nde.nl/ontology/hc/slot/video_id
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: VideoIdentifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/video_comment
+      revision:
+        - label: has_or_had_comment
+          type: slot
+        - label: Comment
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/video_category_id
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: VideoCategoryIdentifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/viability_status
+      revision:
+        - label: has_or_had_status
+          type: slot
+        - label: ViabilityStatus
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/version_number
+      revision:
+        - label: has_or_had_version
+          type: slot
+        - label: VersionNumber
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/verified_by
+      revision:
+        - label: is_or_was_verified_by
+          type: slot
+        - label: Verifier
+          type: class
+        - label: had_or_had_identifier
+          type: slot
+        - label: Identifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/verified  
+      revision:
+        - label: has_or_had_verification_status
+          type: slot
+        - label: VerificationStatus
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/verification_date
+      revision:
+        - label: temporal_extent
+          type: slot
+        - label: TimeSpan
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/vendor_url
+      revision:
+        - label: has_or_had_url
+          type: slot
+        - label: URL
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/vendor_name
+      revision:
+        - label: has_or_had_label
+          type: slot
+        - label: Label
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/variant_of_name
+      revision:
+        - label: is_or_was_alternative_form_of
+          type: slot
+        - label: Label
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/validity_period
+      revision:
+        - label: temporal_extent
+          type: slot
+        - label: TimeSpan
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/validation_status
+      revision:
+        - label: has_or_had_status
+          type: slot
+        - label: ValidationStatus
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/valid_to_geo
+      revision:
+        - label: temporal_extent
+          type: slot
+        - label: TimeSpan
+          type: class
+        - label: end_of_the_end
+          type: slot
+        - label: Timestamp
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/valid_to
+      revision:
+        - label: temporal_extent
+          type: slot
+        - label: TimeSpan
+          type: class
+        - label: end_of_the_end
+          type: slot
+        - label: Timestamp
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/valid_from_geo
+      revision:
+        - label: temporal_extent
+          type: slot
+        - label: TimeSpan
+          type: class
+        - label: begin_of_the_begin
+          type: slot
+        - label: Timestamp
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/valid_from
+      revision:
+        - label: temporal_extent
+          type: slot
+        - label: TimeSpan
+          type: class
+        - label: begin_of_the_begin
+          type: slot
+        - label: Timestamp
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/uv_filtered_required
+      revision:
+        - label: is_or_was_required
+          type: slot
+        - label: RequirementStatus
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: RequirementType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: RequirementTypes
+          type: class
+          value:
+            - UV Filtered lighting
+    - original_slot_id: https://nde.nl/ontology/hc/slot/user_community
+      revision:
+        - label: serves_or_served
+          type: slot
+        - label: UserCommunity
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: UserCommunityType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: UserCommunityTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/used_by_custodian
+      revision:
+        - label: is_or_was_used_by
+          type: slot
+        - label: Custodian
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/used_by
+      revision:
+        - label: provides_or_provided_provenance_to
+          type: slot
+        - label: Entity
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/used
+      revision:
+        - label: provides_or_provided_provenance_to
+          type: slot
+        - label: ReconstructionActivity
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/url
+      revision:
+        - label: has_or_had_url
+          type: slot
+        - label: URL
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/updated_at
+      revision:
+        - label: was_last_updated_at
+          type: slot
+        - label: TimeSpan
+          type: class
+        - label: end_of_the_end
+          type: slot
+        - label: Timestamp
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/update_frequency
+      revision:
+        - label: has_or_had_frequency
+          type: slot
+        - label: UpdateFrequency
+          type: class
+        - label: has_or_had_quantity
+          type: slot
+          link_branch: 1
+        - label: Quantity
+          type: class
+          link_branch: 1
+        - label: has_or_had_time_interval
+          type: slot
+          link_branch: 2
+        - label: TimeInterval
+          type: class
+          link_branch: 2
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unit_type
+      revision:
+        - label: has_or_had_type
+          type: slot
+        - label: OrganizationalUnitType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: OrganizationalUnitTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unit_name
+      revision:
+        - label: has_or_had_label
+          type: slot
+        - label: Label
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unit_identifier
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: Identifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unit_id 
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: Identifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unit_description
+      revision:
+        - label: has_or_had_description
+          type: slot
+        - label: Description
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unit_affiliation
+      revision:
+        - label: is_or_was_affiliated_with
+          type: slot
+        - label: OrganizationUnit
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unique_object_count
+      revision:
+        - label: has_or_had_quantity
+          type: slot
+        - label: Quantity
+          type: class
+        - label: had_or_had_measurement_unit
+          type: slot
+          value:
+            - object
+          link_branch: 1
+        - label: MeasureUnit
+          type: class
+          link_branch: 1
+        - label: has_or_had_methodology
+          type: slot
+          link_branch: 2
+        - label: Methodology
+          type: class
+          value:
+            - entity_resolution
+          link_branch: 2
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unique_face_count
+      revision:
+        - label: has_or_had_quantity
+          type: slot
+        - label: Quantity
+          type: class
+        - label: had_or_had_measurement_unit
+          type: slot
+          link_branch: 1
+        - label: MeasureUnit
+          type: class
+          value:
+            - face
+          link_branch: 1
+        - label: has_or_had_methodology
+          type: slot
+          link_branch: 2
+        - label: Methodology
+          type: class
+          value:
+            - entity_resolution
+          link_branch: 2
+    - original_slot_id: https://nde.nl/ontology/hc/slot/uniform_title
+      revision:
+        - label: has_or_had_label
+          type: slot
+        - label: Label
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: TitleType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: TitleTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unesco_list_status
+      revision:
+        - label: has_or_had_status
+          type: slot
+        - label: UNESCOListStatus
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unesco_inscription_year
+      revision:
+        - label: temporal_extent
+          type: slot
+        - label: TimeSpan
+          type: class
+        - label: begin_of_the_begin
+          type: slot
+        - label: Timestamp
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/unesco_domain
+      revision:
+        - label: is_or_was_categorized_as
+          type: slot
+        - label: UNESCODomain
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: UNESCODomainType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: UNESCODomainTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/typical_technical_feature
+      revision:
+        - label: has_or_had_feature
+          type: slot
+        - label: TechnicalFeature
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: TechnicalFeatureType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: TechnicalFeatureTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/typical_scope
+      revision:
+        - label: has_or_had_scope
+          type: slot
+        - label: Scope
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: ScopeType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: ScopeTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/typical_responsibility
+      revision:
+        - label: has_or_had_responsibility
+          type: slot
+        - label: Responsibility
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: ResponsibilityType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: ResponsibilityTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/typical_response_formats
+      revision:
+        - label: has_or_had_format
+          type: slot
+        - label: ResponseFormat
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: ResponseFormatType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: ResponseFormatTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/typical_metadata_standard
+      revision:
+        - label: has_or_had_standard
+          type: slot
+        - label: MetadataStandard
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: MetadataStandardType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: MetadataStandardTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/typical_http_methods
+      revision:
+        - label: has_or_had_method
+          type: slot
+        - label: HTTPMethod
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: HTTPMethodType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: HTTPMethodTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/typical_grant_range
+      revision:
+        - label: has_or_had_range
+          type: slot
+        - label: GrantRange
+          type: class
+        - label: minimal_of_minimal
+          type: slot
+          link_branch: 1
+        - label: Quantity
+          type: class
+          link_branch: 1
+        - label: maximal_of_maximal
+          type: slot
+          link_branch: 2
+        - label: Quantity
+          type: class
+          link_branch: 2
+    - original_slot_id: https://nde.nl/ontology/hc/slot/typical_domain
+      revision:
+        - label: has_or_had_domain
+          type: slot
+        - label: Domain
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: DomainType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: DomainTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/typical_condition
+      revision:
+        - label: has_or_had_condition
+          type: slot
+        - label: Condition
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: ConditionType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: ConditionTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/typical_approval_time
+      revision:
+        - label: has_or_had_time_interval
+          type: slot
+        - label: TimeInterval
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: ApprovalTimeType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: ApprovalTimeTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/type_status
+      revision:
+        - label: has_or_had_status
+          type: slot
+        - label: TypeStatus
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/type_scope
+      revision:
+        - label: has_or_had_scope
+          type: slot
+        - label: Scope
+          type: class
+        - label: has_or_had_type
+          type: slot
+        - label: ScopeType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: ScopeTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/type_label
+      revision:
+        - label: has_or_had_label
+          type: slot
+        - label: Label
+          type: class
+        - label: has_or_had_language
+          type: slot
+        - label: Language 
+          type: class 
+        - label: has_or_had_identifier
+          type: slot
+        - label: ISO639-3Identifier
+          type: class
+    - 
--- a/schemas/20251121/linkml/modules/slots/was_approved_by.yaml
+++ b/schemas/20251121/linkml/modules/slots/was_approved_by.yaml
@ -1,41 +0,0 @@
-id: https://nde.nl/ontology/hc/slot/was_approved_by
-name: was_approved_by_slot
-title: Was Approved By Slot
-prefixes:
-  dcterms: http://purl.org/dc/terms/
-  hc: https://nde.nl/ontology/hc/
-  linkml: https://w3id.org/linkml/
-  prov: http://www.w3.org/ns/prov#
-  schema: http://schema.org/
-imports:
- linkml:types
-default_prefix: hc
-slots:
-  was_approved_by:
-    description: 'Governance body or authority that approved budget.
-
-
-      **Examples**:
-
-      - "Board of Directors"
-
-      - "Executive Committee"
-
-      - "Ministry of Culture"
-
-      - "City Council"
-
-      '
-    range: string
-    slot_uri: prov:wasAttributedTo
-    exact_mappings:
-    - prov:wasAttributedTo
-    close_mappings:
-    - dcterms:creator
-    - prov:wasInfluencedBy
-    annotations:
-      custodian_types: '["*"]'
-      custodian_types_rationale: Applicable to all heritage custodian types.
-      custodian_types_primary: M
-      specificity_score: 0.5
-      specificity_rationale: Moderately specific slot.