Refactor schema: Migrate slots to new patterns and create new classes

- Migrated `audio_event_segments` to `has_or_had_segment` with range `AudioEventSegment` in VideoAudioAnnotation.yaml.
- Removed deprecated slots: `approved_by`, `audio_event_segments`, `bay_number`, `box_number`, and `budget_status`.
- Created new classes: `AudioEventSegment`, `BayNumber`, `BoxNumber`, and `BudgetStatus` to encapsulate previously slot-based data.
- Introduced `has_or_had_auxiliary_entities` slot to replace `auxiliary_places` and `auxiliary_platforms`.
- Archived removed slots to maintain historical context.
- Updated LinkMLViewerPage to utilize new schema element popup for better navigation.

frontend/public/schemas/20251121/linkml/manifest.json

@@ -1,12 +1,12 @@
 {
-  "generated": "2026-01-14T14:13:07.428Z",
+  "generated": "2026-01-14T14:15:37.461Z",
   "schemaRoot": "/schemas/20251121/linkml",
-  "totalFiles": 2884,
+  "totalFiles": 2883,
   "categoryCounts": {
     "main": 4,
-    "class": 679,
+    "class": 683,
     "enum": 147,
-    "slot": 2050,
+    "slot": 2045,
     "module": 4
   },
   "categories": [
@@ -280,6 +280,11 @@
           "path": "modules/classes/AssociationArchive.yaml",
           "category": "class"
         },
+        {
+          "name": "AudioEventSegment",
+          "path": "modules/classes/AudioEventSegment.yaml",
+          "category": "class"
+        },
         {
           "name": "AudiovisualArchive",
           "path": "modules/classes/AudiovisualArchive.yaml",
@@ -345,6 +350,11 @@
           "path": "modules/classes/BankArchiveRecordSetTypes.yaml",
           "category": "class"
         },
+        {
+          "name": "BayNumber",
+          "path": "modules/classes/BayNumber.yaml",
+          "category": "class"
+        },
         {
           "name": "Bildstelle",
           "path": "modules/classes/Bildstelle.yaml",
@@ -380,6 +390,11 @@
           "path": "modules/classes/Bookplate.yaml",
           "category": "class"
         },
+        {
+          "name": "BoxNumber",
+          "path": "modules/classes/BoxNumber.yaml",
+          "category": "class"
+        },
         {
           "name": "BranchOffice",
           "path": "modules/classes/BranchOffice.yaml",
@@ -400,6 +415,11 @@
           "path": "modules/classes/Budget.yaml",
           "category": "class"
         },
+        {
+          "name": "BudgetStatus",
+          "path": "modules/classes/BudgetStatus.yaml",
+          "category": "class"
+        },
         {
           "name": "BudgetType",
           "path": "modules/classes/BudgetType.yaml",
@@ -4227,11 +4247,6 @@
           "path": "modules/slots/applies_to_call.yaml",
           "category": "slot"
         },
-        {
-          "name": "approved_by",
-          "path": "modules/slots/approved_by.yaml",
-          "category": "slot"
-        },
         {
           "name": "approximate",
           "path": "modules/slots/approximate.yaml",
@@ -4252,11 +4267,6 @@
           "path": "modules/slots/asserted_by.yaml",
           "category": "slot"
         },
-        {
-          "name": "audio_event_segments",
-          "path": "modules/slots/audio_event_segments.yaml",
-          "category": "slot"
-        },
         {
           "name": "authors",
           "path": "modules/slots/authors.yaml",
@@ -4282,11 +4292,6 @@
           "path": "modules/slots/base_surname.yaml",
           "category": "slot"
         },
-        {
-          "name": "bay_number",
-          "path": "modules/slots/bay_number.yaml",
-          "category": "slot"
-        },
         {
           "name": "begin_of_the_begin",
           "path": "modules/slots/begin_of_the_begin.yaml",
@@ -4342,11 +4347,6 @@
           "path": "modules/slots/bounding_box.yaml",
           "category": "slot"
         },
-        {
-          "name": "box_number",
-          "path": "modules/slots/box_number.yaml",
-          "category": "slot"
-        },
         {
           "name": "branch_head",
           "path": "modules/slots/branch_head.yaml",
@@ -4367,11 +4367,6 @@
           "path": "modules/slots/budget_currency.yaml",
           "category": "slot"
         },
-        {
-          "name": "budget_status",
-          "path": "modules/slots/budget_status.yaml",
-          "category": "slot"
-        },
         {
           "name": "building_floor_area_sqm",
           "path": "modules/slots/building_floor_area_sqm.yaml",

frontend/public/schemas/20251121/linkml/modules/classes/AudioEventSegment.yaml

@@ -0,0 +1,172 @@
+id: https://nde.nl/ontology/hc/class/AudioEventSegment
+name: audio_event_segment_class
+title: Audio Event Segment Class
+description: |
+  A temporal segment of audio containing a detected audio event (speech, music, silence, etc.).
+  
+  MIGRATED from audio_event_segments slot (Rule 53).
+  Uses generic has_or_had_segment slot with range narrowed to AudioEventSegment.
+imports:
+  - linkml:types
+  - ../slots/start_seconds
+  - ../slots/end_seconds
+  - ../slots/start_time
+  - ../slots/end_time
+  - ../slots/segment_index
+  - ../slots/segment_text
+  - ../slots/confidence
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+  - ../enums/AudioEventTypeEnum
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  oa: http://www.w3.org/ns/oa#
+  ma: http://www.w3.org/ns/ma-ont#
+default_prefix: hc
+
+classes:
+  AudioEventSegment:
+    class_uri: hc:AudioEventSegment
+    description: |
+      A temporal segment of audio containing a detected audio event.
+      
+      **DEFINITION**:
+      
+      AudioEventSegment represents a bounded temporal portion of audio content
+      where a specific type of audio event has been detected. This includes:
+      - Speech segments (with optional speaker/language info)
+      - Music segments (with optional genre/type info)
+      - Silence segments (gaps between audio)
+      - Sound event segments (applause, laughter, ambient sounds)
+      - Noise segments (for quality assessment)
+      
+      **RELATIONSHIP TO VideoTimeSegment**:
+      
+      AudioEventSegment is a specialized sibling of VideoTimeSegment:
+      - Both extend CIDOC-CRM E52_Time-Span concept
+      - VideoTimeSegment: general video temporal segments
+      - AudioEventSegment: audio-specific event segments
+      
+      **AUDIO EVENT TYPES**:
+      
+      | Event Type | Description | Example |
+      |------------|-------------|---------|
+      | SPEECH | Human speech detected | Interview segment |
+      | MUSIC | Music detected | Background soundtrack |
+      | SILENCE | Very low or no audio | Gap between segments |
+      | SOUND_EVENT | Non-speech/music sounds | Applause, footsteps |
+      | NOISE | Noise/interference | Quality issue marker |
+      | MIXED | Multiple event types | Overlapping audio |
+      
+      **HERITAGE USE CASES**:
+      
+      | Content Type | Application |
+      |--------------|-------------|
+      | Oral histories | Speech segment identification |
+      | Virtual tours | Background music detection |
+      | Lecture recordings | Audience reaction segments |
+      | Conservation videos | Narration vs ambient sound |
+      | Archival footage | Audio quality assessment |
+      
+      **PROVENANCE**:
+      
+      Created as part of slot migration (Rule 53) from deprecated
+      `audio_event_segments` slot to generic `has_or_had_segment` pattern.
+    exact_mappings:
+      - hc:AudioEventSegment
+    close_mappings:
+      - crm:E52_Time-Span
+      - ma:MediaFragment
+    related_mappings:
+      - oa:FragmentSelector
+    slots:
+      - start_seconds
+      - end_seconds
+      - start_time
+      - end_time
+      - segment_index
+      - segment_text
+      - confidence
+      - specificity_annotation
+      - template_specificity
+    attributes:
+      audio_event_type:
+        range: AudioEventTypeEnum
+        required: true
+        description: The type of audio event detected in this segment.
+        examples:
+          - value: SPEECH
+            description: Speech detected in this segment
+          - value: MUSIC
+            description: Music detected in this segment
+    slot_usage:
+      start_seconds:
+        range: float
+        required: true
+        minimum_value: 0.0
+        description: Start time in seconds for this audio event segment.
+        examples:
+          - value: 0.0
+            description: Audio event starts at beginning
+          - value: 45.5
+            description: Audio event starts at 45.5 seconds
+      end_seconds:
+        range: float
+        required: true
+        minimum_value: 0.0
+        description: End time in seconds for this audio event segment.
+        examples:
+          - value: 15.0
+            description: Audio event ends at 15 seconds
+          - value: 60.0
+            description: Audio event ends at 1 minute
+      start_time:
+        range: string
+        required: false
+        pattern: "^PT(\\d+H)?(\\d+M)?(\\d+(\\.\\d+)?S)?$"
+        description: Start time in ISO 8601 duration format.
+        examples:
+          - value: PT0M30S
+            description: 30 seconds from start
+      end_time:
+        range: string
+        required: false
+        pattern: "^PT(\\d+H)?(\\d+M)?(\\d+(\\.\\d+)?S)?$"
+        description: End time in ISO 8601 duration format.
+        examples:
+          - value: PT0M45S
+            description: 45 seconds from start
+      segment_text:
+        range: string
+        required: false
+        description: Text content for this segment (e.g., speech transcript, music description).
+        examples:
+          - value: "Welcome to the Rijksmuseum"
+            description: Speech transcript text
+          - value: "Classical background music"
+            description: Music segment description
+      confidence:
+        range: float
+        required: false
+        minimum_value: 0.0
+        maximum_value: 1.0
+        description: Confidence score (0.0-1.0) for the audio event detection.
+        examples:
+          - value: 0.95
+            description: High confidence detection
+          - value: 0.72
+            description: Medium confidence detection
+    comments:
+      - Audio event segment for speech, music, silence, sound event detection
+      - Temporal boundaries with start/end seconds (primary) and ISO 8601 (secondary)
+      - Confidence scoring for AI-generated detections
+      - Part of Rule 53 slot migration from audio_event_segments
+    see_also:
+      - https://www.w3.org/TR/media-frags/
+      - https://www.w3.org/ns/ma-ont

frontend/public/schemas/20251121/linkml/modules/classes/BayNumber.yaml

@@ -0,0 +1,92 @@
+id: https://nde.nl/ontology/hc/class/BayNumber
+name: bay_number_class
+title: Bay Number Class
+description: |
+  A storage bay or section identifier within a storage row.
+  
+  MIGRATED from bay_number slot (Rule 53).
+  Uses generic has_or_had_identifier slot with range narrowed to BayNumber.
+imports:
+  - linkml:types
+  - ../slots/identifier_value
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+default_prefix: hc
+
+classes:
+  BayNumber:
+    class_uri: hc:BayNumber
+    description: |
+      An identifier for a storage bay or section within a row/aisle of a storage facility.
+      
+      **DEFINITION**:
+      
+      BayNumber represents a discrete location identifier within a storage system.
+      In heritage storage facilities, storage is typically organized hierarchically:
+      
+      ```
+      Storage Facility
+        └── Zone (environmental control)
+            └── Row/Aisle (physical corridor)
+                └── Bay/Section (THIS CLASS - vertical unit in row)
+                    └── Shelf (horizontal level within bay)
+                        └── Storage Unit (box, drawer, etc.)
+      ```
+      
+      **TYPICAL VALUES**:
+      
+      | Format | Example | Description |
+      |--------|---------|-------------|
+      | Numeric | "3", "12" | Sequential bay numbers |
+      | Alphabetic | "A", "C", "AA" | Lettered bays |
+      | Mixed | "3A", "B2" | Combined formats |
+      | Descriptive | "North-3" | Location-based |
+      
+      **HERITAGE USE CASES**:
+      
+      | Institution Type | Bay Naming Convention |
+      |------------------|----------------------|
+      | Archives | Sequential numeric (1, 2, 3...) |
+      | Museums | Alphanumeric by collection area |
+      | Libraries | By call number range |
+      | Natural history | By specimen type |
+      
+      **PROVENANCE**:
+      
+      Created as part of slot migration (Rule 53) from deprecated
+      `bay_number` slot to generic `has_or_had_identifier` pattern.
+    exact_mappings:
+      - hc:BayNumber
+    close_mappings:
+      - crm:E42_Identifier
+    related_mappings:
+      - schema:identifier
+    slots:
+      - specificity_annotation
+      - template_specificity
+    attributes:
+      value:
+        range: string
+        required: true
+        description: The bay number/identifier value.
+        examples:
+          - value: "3"
+            description: Numeric bay number
+          - value: "C"
+            description: Alphabetic bay identifier
+          - value: "North-3"
+            description: Location-descriptive bay
+    comments:
+      - Storage bay identifier within a row/aisle
+      - Part of hierarchical storage location addressing
+      - Part of Rule 53 slot migration from bay_number
+    see_also:
+      - https://nde.nl/ontology/hc/StorageUnit

frontend/public/schemas/20251121/linkml/modules/classes/BoxNumber.yaml

@@ -0,0 +1,97 @@
+id: https://nde.nl/ontology/hc/class/BoxNumber
+name: box_number_class
+title: Box Number Class
+description: |
+  A storage box number or position identifier on a shelf.
+  
+  MIGRATED from box_number slot (Rule 53).
+  Uses generic has_or_had_identifier slot with range narrowed to BoxNumber.
+imports:
+  - linkml:types
+  - ../slots/identifier_value
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+default_prefix: hc
+
+classes:
+  BoxNumber:
+    class_uri: hc:BoxNumber
+    description: |
+      An identifier for a storage box or its position on a shelf.
+      
+      **DEFINITION**:
+      
+      BoxNumber represents the position or identifier of a storage box within 
+      a storage unit hierarchy. Archive boxes are the most common physical 
+      containers for heritage materials, particularly in archives.
+      
+      ```
+      Shelf
+        └── Box 1 (THIS CLASS - position on shelf)
+        └── Box 2
+        └── Box 3
+        ...
+      ```
+      
+      **TYPICAL VALUES**:
+      
+      | Type | Example | Description |
+      |------|---------|-------------|
+      | Sequential | 1, 2, 3, 12 | Position on shelf left-to-right |
+      | Inventory | 145, 2024-0042 | Unique box inventory number |
+      | Combined | 12.3 | Bay 12, Box 3 |
+      
+      **ARCHIVE BOX STANDARDS**:
+      
+      Heritage institutions typically use acid-free archive boxes conforming to:
+      - ISO 16245 (Boxes for documents)
+      - ANSI/NISO Z39.77 (Guidelines for materials in archives)
+      
+      **HERITAGE USE CASES**:
+      
+      | Material Type | Box Format |
+      |---------------|------------|
+      | Documents | Standard archive box (legal/letter) |
+      | Photographs | Photo storage boxes |
+      | Oversized | Flat boxes, tubes |
+      | Fragile | Custom padded boxes |
+      
+      **PROVENANCE**:
+      
+      Created as part of slot migration (Rule 53) from deprecated
+      `box_number` slot to generic `has_or_had_identifier` pattern.
+    exact_mappings:
+      - hc:BoxNumber
+    close_mappings:
+      - crm:E42_Identifier
+    related_mappings:
+      - schema:identifier
+    slots:
+      - specificity_annotation
+      - template_specificity
+    attributes:
+      value:
+        range: integer
+        required: true
+        minimum_value: 1
+        description: The box number (position on shelf or inventory number).
+        examples:
+          - value: 12
+            description: Box at position 12 on shelf
+          - value: 145
+            description: Archive box inventory number 145
+    comments:
+      - Storage box position identifier
+      - Typically integer representing shelf position or inventory number
+      - Part of Rule 53 slot migration from box_number
+    see_also:
+      - https://nde.nl/ontology/hc/StorageUnit
+      - https://www.wikidata.org/wiki/Q854619

frontend/public/schemas/20251121/linkml/modules/classes/Budget.yaml

@@ -16,7 +16,10 @@ imports:
 - ../slots/budget_currency
 - ../slots/has_or_had_description
 - ../slots/has_or_had_label
-- ../slots/budget_status
+# REMOVED - migrated to has_or_had_status with range BudgetStatus (Rule 53)
+# - ../slots/budget_status
+- ../slots/has_or_had_status
+- ./BudgetStatus
 - ../slots/has_or_had_type
 - ../slots/capital_budget
 - ./BudgetType
@@ -97,7 +100,9 @@ classes:
     - budget_currency
     - has_or_had_description
     - has_or_had_label
-    - budget_status
+    # MIGRATED from budget_status to has_or_had_status (Rule 53)
+    # - budget_status
+    - has_or_had_status
     - has_or_had_type
     - capital_budget
     - digitization_budget
@@ -249,12 +254,25 @@ classes:
         description: Agent (person/organization) that approved this budget
         range: string
         required: false
-      budget_status:
+      # MIGRATED from budget_status to has_or_had_status (Rule 53)
-        range: string
+      # budget_status:
+      #   range: string
+      #   required: true
+      #   examples:
+      #   - value: ACTIVE
+      #     description: Current fiscal year budget in effect
+      has_or_had_status:
+        description: |
+          MIGRATED from budget_status (Rule 53).
+          Current status of this budget in its lifecycle.
+          Uses BudgetStatus class for structured status tracking.
+        range: BudgetStatus
         required: true
         examples:
-        - value: ACTIVE
+        - value: '{value: "ACTIVE", effective_date: "2024-01-01"}'
-          description: Current fiscal year budget in effect
+          description: Budget currently in effect
+        - value: '{value: "DRAFT", effective_date: "2023-10-01"}'
+          description: Budget under development
       revision_number:
         range: integer
         required: false
@@ -319,7 +337,9 @@ classes:
         endowment_draw: 5000000.0
         approval_date: '2023-11-15'
         is_or_was_approved_by: Board of Directors
-        budget_status: ACTIVE
+        has_or_had_status:
+          value: ACTIVE
+          effective_date: '2024-01-01'
         refers_to_custodian: https://nde.nl/ontology/hc/nl-nh-ams-m-rm-q190804
       description: Major museum annual operating budget
     - value:
@@ -341,6 +361,8 @@ classes:
         internal_funding: 2500000.0
         approval_date: '2024-03-01'
         is_or_was_approved_by: Province of Noord-Holland
-        budget_status: ACTIVE
+        has_or_had_status:
+          value: ACTIVE
+          effective_date: '2024-04-01'
         refers_to_custodian: https://nde.nl/ontology/hc/nl-nh-haa-a-nha
       description: Regional archive government-funded budget

frontend/public/schemas/20251121/linkml/modules/classes/BudgetStatus.yaml

@@ -0,0 +1,105 @@
+id: https://nde.nl/ontology/hc/class/BudgetStatus
+name: budget_status_class
+title: Budget Status Class
+description: |
+  Status of a heritage custodian budget throughout its lifecycle.
+  
+  MIGRATED from budget_status slot (Rule 53).
+  Uses generic has_or_had_status slot with range narrowed to BudgetStatus.
+imports:
+  - linkml:types
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+  frapo: http://purl.org/cerif/frapo/
+default_prefix: hc
+
+classes:
+  BudgetStatus:
+    class_uri: hc:BudgetStatus
+    description: |
+      Status of a budget document throughout its lifecycle.
+      
+      **DEFINITION**:
+      
+      BudgetStatus represents the current state of a budget document
+      as it moves through the approval and execution lifecycle.
+      
+      **BUDGET LIFECYCLE STAGES**:
+      
+      ```
+      DRAFT → PROPOSED → APPROVED → ACTIVE → REVISED → CLOSED
+                ↓            ↓
+             REJECTED     SUPERSEDED
+      ```
+      
+      **STATUS VALUES**:
+      
+      | Status | Description | Typical Duration |
+      |--------|-------------|------------------|
+      | DRAFT | Under development | Weeks/months |
+      | PROPOSED | Submitted for approval | Days/weeks |
+      | APPROVED | Officially approved | Until fiscal start |
+      | ACTIVE | Currently in effect | Fiscal year |
+      | REVISED | Modified after approval | Variable |
+      | CLOSED | Fiscal period ended | Permanent |
+      | REJECTED | Not approved | Terminal |
+      | SUPERSEDED | Replaced by revision | Terminal |
+      
+      **HERITAGE INSTITUTION CONTEXT**:
+      
+      Heritage institution budgets typically follow these approval paths:
+      
+      | Institution Type | Approval Authority |
+      |------------------|-------------------|
+      | Museum (stichting) | Board of Directors |
+      | Regional Archive | Provincial Government |
+      | National Library | Ministry of Culture |
+      | University Collection | University Board |
+      
+      **PROVENANCE**:
+      
+      Created as part of slot migration (Rule 53) from deprecated
+      `budget_status` slot to generic `has_or_had_status` pattern.
+    exact_mappings:
+      - hc:BudgetStatus
+    close_mappings:
+      - schema:status
+    related_mappings:
+      - dcterms:status
+    slots:
+      - specificity_annotation
+      - template_specificity
+    attributes:
+      value:
+        range: string
+        required: true
+        description: |
+          The budget status value.
+          Valid values: DRAFT, PROPOSED, APPROVED, ACTIVE, REVISED, CLOSED, REJECTED, SUPERSEDED
+        examples:
+          - value: ACTIVE
+            description: Budget currently in effect
+          - value: DRAFT
+            description: Budget under development
+          - value: CLOSED
+            description: Fiscal period ended
+      effective_date:
+        range: date
+        required: false
+        description: Date when this status became effective.
+        examples:
+          - value: "2024-01-01"
+            description: Status effective from start of year
+    comments:
+      - Budget lifecycle status tracking
+      - Supports audit trail of budget state changes
+      - Part of Rule 53 slot migration from budget_status
+    see_also:
+      - https://nde.nl/ontology/hc/Budget

frontend/public/schemas/20251121/linkml/modules/classes/StorageConditionPolicy.yaml

@@ -31,7 +31,7 @@ imports:
 - ../slots/light_max_lux
 - ../slots/particulate_max
 - ../slots/pest_management_required
-- ../slots/policy_approved_by
+- ../slots/is_or_was_approved_by  # MIGRATED: was ../slots/policy_approved_by (2026-01-15)
 - ../slots/policy_description
 - ../slots/policy_effective_from
 - ../slots/policy_effective_to
@@ -46,6 +46,7 @@ imports:
 - ../slots/uv_filtered_required
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
+- ./Approver  # Added for is_or_was_approved_by migration (2026-01-15)
 classes:
   StorageConditionPolicy:
     class_uri: odrl:Policy
@@ -91,7 +92,7 @@ classes:
     - note
     - particulate_max
     - pest_management_required
-    - policy_approved_by
+    - is_or_was_approved_by  # MIGRATED: was policy_approved_by (2026-01-15)
     - policy_description
     - policy_effective_from
     - policy_effective_to

frontend/public/schemas/20251121/linkml/modules/classes/StorageUnit.yaml

@@ -17,8 +17,13 @@ imports:
 - ../slots/unit_name
 - ../slots/unit_type
 - ../slots/capacity_item
-- ../slots/bay_number
+# REMOVED - migrated to has_or_had_identifier with range BayNumber (Rule 53)
-- ../slots/box_number
+# - ../slots/bay_number
+# REMOVED - migrated to has_or_had_identifier with range BoxNumber (Rule 53)
+# - ../slots/box_number
+- ../slots/has_or_had_identifier
+- ./BayNumber
+- ./BoxNumber
 - ../slots/current_item_count
 - ../slots/drawer_number
 - ../slots/part_of_storage
@@ -75,8 +80,10 @@ classes:
     - hc:EnvironmentalZone
     - schema:Place
     slots:
-    - bay_number
+    # MIGRATED from bay_number and box_number to has_or_had_identifier (Rule 53)
-    - box_number
+    # - bay_number
+    # - box_number
+    - has_or_had_identifier
     - capacity_item
     - current_item_count
     - drawer_number
@@ -124,11 +131,22 @@ classes:
         - value: A
         - value: '12'
         - value: North-3
-      bay_number:
+      has_or_had_identifier:
+        description: |
+          MIGRATED from bay_number and box_number (Rule 53).
+          Storage location identifiers including bay and box numbers.
+          Use BayNumber for bay/section identifiers, BoxNumber for box positions.
         range: string
+        multivalued: true
         examples:
-        - value: '3'
+        - value: '[{type: BayNumber, value: "3"}, {type: BoxNumber, value: 12}]'
-        - value: C
+          description: Bay 3, Box 12
+      # DEPRECATED - use has_or_had_identifier with range BayNumber
+      # bay_number:
+      #   range: string
+      #   examples:
+      #   - value: '3'
+      #   - value: C
       shelf_number:
         range: integer
         examples:
@@ -138,10 +156,11 @@ classes:
         range: integer
         examples:
         - value: 3
-      box_number:
+      # DEPRECATED - use has_or_had_identifier with range BoxNumber
-        range: integer
+      # box_number:
-        examples:
+      #   range: integer
-        - value: 12
+      #   examples:
+      #   - value: 12
       capacity_item:
         range: integer
       current_item_count:

frontend/public/schemas/20251121/linkml/modules/classes/VideoAudioAnnotation.yaml

@@ -5,7 +5,10 @@ imports:
 - linkml:types
 - ./VideoAnnotation
 - ./VideoTimeSegment
-- ../slots/audio_event_segments
+- ./AudioEventSegment
+# REMOVED - migrated to has_or_had_segment with range AudioEventSegment (Rule 53)
+# - ../slots/audio_event_segments
+- ../slots/has_or_had_segment
 - ../slots/has_audio_quality_score
 - ../slots/diarization_confidence
 - ../slots/diarization_enabled
@@ -112,7 +115,9 @@ classes:
     - wikidata:Q11028
     - wikidata:Q638
     slots:
-    - audio_event_segments
+    # MIGRATED from audio_event_segments to has_or_had_segment (Rule 53)
+    # - audio_event_segments
+    - has_or_had_segment
     - audio_quality_score
     - diarization_enabled
     - has_or_had_diarization_segment
@@ -138,6 +143,20 @@ classes:
     - has_or_had_speech_segment
     - template_specificity
     slot_usage:
+      has_or_had_segment:
+        description: |
+          MIGRATED from audio_event_segments (Rule 53).
+          Audio event segments detected in the video content.
+        range: AudioEventSegment
+        multivalued: true
+        required: false
+        inlined_as_list: true
+        examples:
+        - value: '[{audio_event_type: SPEECH, start_seconds: 0.0, end_seconds: 15.0, segment_text: "Speech detected - Speaker 1", confidence: 0.95}]'
+          description: Speech detection segment
+        - value: '[{audio_event_type: MUSIC, start_seconds: 30.0, end_seconds: 60.0, segment_text: "Background classical music", confidence: 0.88}]'
+          description: Music detection segment
+      # NOTE: has_audio_event_segment is deprecated - use has_or_had_segment above
       has_audio_event_segment:
         range: VideoTimeSegment
         multivalued: true

frontend/public/schemas/20251121/linkml/modules/slots/slot_fixes.yaml

@@ -1344,3 +1344,106 @@ fixes:
           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
+    - 

frontend/src/pages/LinkMLViewerPage.tsx

@@ -2595,7 +2595,7 @@ const LinkMLViewerPage: React.FC = () => {
                         <button 
                           key={subclass} 
                           className="linkml-viewer__exports-link"
-                          onClick={() => navigateToClass(subclass)}
+                          onClick={() => setSchemaElementPopup({ name: subclass, type: 'class' })}
                         >
                           {subclass}
                         </button>
@@ -2612,7 +2612,7 @@ const LinkMLViewerPage: React.FC = () => {
                         <button 
                           key={user} 
                           className="linkml-viewer__exports-link"
-                          onClick={() => navigateToClass(user)}
+                          onClick={() => setSchemaElementPopup({ name: user, type: 'class' })}
                         >
                           {user}
                         </button>
@@ -2642,7 +2642,7 @@ const LinkMLViewerPage: React.FC = () => {
                         <button 
                           key={`${className}-${slotName}`} 
                           className="linkml-viewer__exports-link"
-                          onClick={() => navigateToClass(className)}
+                          onClick={() => setSchemaElementPopup({ name: className, type: 'class' })}
                           title={`via slot: ${slotName}`}
                         >
                           {className} <span className="linkml-viewer__exports-via">via {slotName}</span>
@@ -2660,7 +2660,7 @@ const LinkMLViewerPage: React.FC = () => {
                         <button 
                           key={refClass} 
                           className="linkml-viewer__exports-link"
-                          onClick={() => navigateToClass(refClass)}
+                          onClick={() => setSchemaElementPopup({ name: refClass, type: 'class' })}
                         >
                           {refClass}
                         </button>
@@ -4158,6 +4158,16 @@ const LinkMLViewerPage: React.FC = () => {
           onClose={() => setOntologyPopupCurie(null)}
         />
       )}
+      
+      {/* Schema Element Popup - renders when clicking class/slot/enum in Imports/Exports */}
+      {schemaElementPopup && (
+        <SchemaElementPopup
+          elementName={schemaElementPopup.name}
+          elementType={schemaElementPopup.type}
+          onClose={() => setSchemaElementPopup(null)}
+          onNavigate={handleSchemaElementNavigate}
+        />
+      )}
     </div>
   );
 };

schemas/20251121/linkml/manifest.json

@@ -1,12 +1,12 @@
 {
-  "generated": "2026-01-14T14:14:23.659Z",
+  "generated": "2026-01-14T14:20:53.577Z",
   "schemaRoot": "/schemas/20251121/linkml",
-  "totalFiles": 2884,
+  "totalFiles": 2883,
   "categoryCounts": {
     "main": 4,
-    "class": 679,
+    "class": 683,
     "enum": 147,
-    "slot": 2050,
+    "slot": 2045,
     "module": 4
   },
   "categories": [
@@ -280,6 +280,11 @@
           "path": "modules/classes/AssociationArchive.yaml",
           "category": "class"
         },
+        {
+          "name": "AudioEventSegment",
+          "path": "modules/classes/AudioEventSegment.yaml",
+          "category": "class"
+        },
         {
           "name": "AudiovisualArchive",
           "path": "modules/classes/AudiovisualArchive.yaml",
@@ -345,6 +350,11 @@
           "path": "modules/classes/BankArchiveRecordSetTypes.yaml",
           "category": "class"
         },
+        {
+          "name": "BayNumber",
+          "path": "modules/classes/BayNumber.yaml",
+          "category": "class"
+        },
         {
           "name": "Bildstelle",
           "path": "modules/classes/Bildstelle.yaml",
@@ -380,6 +390,11 @@
           "path": "modules/classes/Bookplate.yaml",
           "category": "class"
         },
+        {
+          "name": "BoxNumber",
+          "path": "modules/classes/BoxNumber.yaml",
+          "category": "class"
+        },
         {
           "name": "BranchOffice",
           "path": "modules/classes/BranchOffice.yaml",
@@ -400,6 +415,11 @@
           "path": "modules/classes/Budget.yaml",
           "category": "class"
         },
+        {
+          "name": "BudgetStatus",
+          "path": "modules/classes/BudgetStatus.yaml",
+          "category": "class"
+        },
         {
           "name": "BudgetType",
           "path": "modules/classes/BudgetType.yaml",
@@ -4227,11 +4247,6 @@
           "path": "modules/slots/applies_to_call.yaml",
           "category": "slot"
         },
-        {
-          "name": "approved_by",
-          "path": "modules/slots/approved_by.yaml",
-          "category": "slot"
-        },
         {
           "name": "approximate",
           "path": "modules/slots/approximate.yaml",
@@ -4252,11 +4267,6 @@
           "path": "modules/slots/asserted_by.yaml",
           "category": "slot"
         },
-        {
-          "name": "audio_event_segments",
-          "path": "modules/slots/audio_event_segments.yaml",
-          "category": "slot"
-        },
         {
           "name": "authors",
           "path": "modules/slots/authors.yaml",
@@ -4282,11 +4292,6 @@
           "path": "modules/slots/base_surname.yaml",
           "category": "slot"
         },
-        {
-          "name": "bay_number",
-          "path": "modules/slots/bay_number.yaml",
-          "category": "slot"
-        },
         {
           "name": "begin_of_the_begin",
           "path": "modules/slots/begin_of_the_begin.yaml",
@@ -4342,11 +4347,6 @@
           "path": "modules/slots/bounding_box.yaml",
           "category": "slot"
         },
-        {
-          "name": "box_number",
-          "path": "modules/slots/box_number.yaml",
-          "category": "slot"
-        },
         {
           "name": "branch_head",
           "path": "modules/slots/branch_head.yaml",
@@ -4367,11 +4367,6 @@
           "path": "modules/slots/budget_currency.yaml",
           "category": "slot"
         },
-        {
-          "name": "budget_status",
-          "path": "modules/slots/budget_status.yaml",
-          "category": "slot"
-        },
         {
           "name": "building_floor_area_sqm",
           "path": "modules/slots/building_floor_area_sqm.yaml",

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

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

schemas/20251121/linkml/modules/slots/slot_fixes.yaml

@@ -421,10 +421,15 @@ fixes:
 
     - original_slot_id: https://nde.nl/ontology/hc/slot/approved_by
       processed:
-        status: false
+        status: true
-        timestamp: null
+        timestamp: '2026-01-14T11:15:00Z'
-        session: null
+        session: "slot-migration-session-8"
-        notes: "Requires Approver class creation"
+        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
       revision:
         - label: is_or_was_approved_by
           type: slot
@@ -610,10 +615,15 @@ fixes:
 
     - original_slot_id: https://nde.nl/ontology/hc/slot/auxiliary_places
       processed:
-        status: false
+        status: true
-        timestamp: null
+        timestamp: '2026-01-14T11:30:00Z'
-        session: null
+        session: "slot-migration-session-8"
-        notes: "Maps to existing AuxiliaryPlace class"
+        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