175 lines
7.6 KiB
YAML
175 lines
7.6 KiB
YAML
id: https://nde.nl/ontology/hc/class/Technique
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name: Technique
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title: Technique Class
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description: |
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A technique or method used in a heritage activity.
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Represents structured technique records with type classification, description,
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and provenance. Used for conservation treatments, examinations, production
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methods, and documentation activities.
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**MIGRATION**: Created to support `uses_or_used_technique` slot per slot_fixes.yaml
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(Rule 53/56, 2026-01-16). Replaces unstructured `techniques_used` string values.
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**Ontology Alignment**:
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- class_uri: crm:E29_Design_or_Procedure
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- CIDOC-CRM: "This class comprises documented or encoded procedures for
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producing and executing activities."
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**Key Properties**:
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- has_or_had_type: Links to TechniqueType subclass (REQUIRED)
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- has_or_had_label: Human-readable technique name
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- has_or_had_description: Detailed description of technique application
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- includes_or_included: Sub-steps or component techniques
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**Example**:
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```yaml
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technique:
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has_or_had_type: SolventCleaning
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has_or_had_label: "Varnish removal with acetone mixture"
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has_or_had_description: |
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Removal of discolored natural resin varnish using
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50:50 acetone/white spirit mixture applied with cotton swabs.
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Working in small sections under magnification.
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```
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prefixes:
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linkml: https://w3id.org/linkml/
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hc: https://nde.nl/ontology/hc/
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crm: http://www.cidoc-crm.org/cidoc-crm/
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schema: http://schema.org/
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skos: http://www.w3.org/2004/02/skos/core#
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aat: http://vocab.getty.edu/aat/
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imports:
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- linkml:types
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- ../slots/has_or_had_identifier
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- ../slots/has_or_had_type
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- ../slots/has_or_had_label
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- ../slots/has_or_had_description
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- ../slots/includes_or_included
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- ./TechniqueType
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- ./TechniqueTypes
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default_prefix: hc
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classes:
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Technique:
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class_uri: crm:E29_Design_or_Procedure
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description: |
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A technique or method used in a heritage activity.
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Provides structured representation of techniques with type classification,
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descriptions, and the ability to reference sub-techniques.
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exact_mappings:
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- crm:E29_Design_or_Procedure
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close_mappings:
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- schema:HowTo
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- aat:300264237 # techniques (processes)
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related_mappings:
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- crm:E55_Type # for technique classification
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slots:
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- has_or_had_identifier
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- has_or_had_type
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- has_or_had_label
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- has_or_had_description
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- includes_or_included
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slot_usage:
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has_or_had_identifier:
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description: Unique identifier for this technique instance or reference to vocabulary term.
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examples:
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- value: aat:300379752
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description: AAT identifier for solvent cleaning
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- value: https://nde.nl/ontology/hc/technique/mauritshuis-670-1994-solvent-cleaning
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description: Instance-specific technique identifier
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has_or_had_type:
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range: TechniqueType
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required: true
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description: |
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The type of technique from the TechniqueType hierarchy.
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Required to classify the technique method.
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examples:
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- value: SolventCleaning
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description: Solvent cleaning technique type
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- value: InfraredReflectography
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description: IR reflectography examination technique
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- value: TratteggioInpainting
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description: Tratteggio inpainting technique
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has_or_had_label:
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description: Human-readable name of the technique as applied.
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examples:
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- value: "Varnish removal with acetone mixture"
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- value: "Tratteggio inpainting of paint losses"
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- value: "Macro XRF scanning"
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has_or_had_description:
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description: |
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Detailed description of how the technique was applied.
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Should include materials, methods, and specific conditions.
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examples:
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- value: |
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Removal of discolored natural resin varnish using
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50:50 acetone/white spirit mixture. Applied with cotton swabs,
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working in small sections under 10x magnification.
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Solvent action monitored continuously.
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- value: |
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Tratteggio inpainting of losses using Gamblin conservation
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colors. Fine parallel brushstrokes at 45-degree angle,
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approximately 1mm spacing.
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includes_or_included:
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range: Technique
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multivalued: true
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inlined_as_list: true
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description: |
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Sub-techniques or component steps within this technique.
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Enables hierarchical technique documentation.
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examples:
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- value:
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has_or_had_type: AqueousCleaning
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has_or_had_label: "Initial surface cleaning"
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has_or_had_description: "Removal of surface grime with distilled water and cotton swabs"
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description: First step in multi-step cleaning process
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comments:
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- Technique represents a procedure or method applied in heritage activities
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- Always requires has_or_had_type to classify the technique
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- Use includes_or_included for complex multi-step procedures
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- Link to vocabulary terms (AAT) via has_or_had_identifier when applicable
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see_also:
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- https://cidoc-crm.org/html/cidoc_crm_v7.1.3.html#E29
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- https://www.getty.edu/research/tools/vocabularies/aat/
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- https://collectionstrust.org.uk/spectrum/
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examples:
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- value:
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has_or_had_identifier: https://nde.nl/ontology/hc/technique/mauritshuis-670-1994-solvent-cleaning
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has_or_had_type: SolventCleaning
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has_or_had_label: "Varnish removal with acetone/white spirit mixture"
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has_or_had_description: |
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Removal of discolored natural resin varnish from Girl with a Pearl Earring.
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Used 50:50 acetone/white spirit mixture applied with cotton swabs.
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Working in small sections under 10x magnification, monitoring
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solvent action continuously to preserve original glazes.
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description: Solvent cleaning technique from 1994 Vermeer restoration
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- value:
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has_or_had_type: TratteggioInpainting
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has_or_had_label: "Tratteggio inpainting of background losses"
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has_or_had_description: |
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Losses in dark background area in-painted using tratteggio technique.
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Fine parallel brushstrokes using Gamblin conservation colors.
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Distinguishable at close range but integrates at normal viewing distance.
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description: Inpainting technique with tratteggio method
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- value:
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has_or_had_type: VacuumLining
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has_or_had_label: "Vacuum table lining with BEVA 371"
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has_or_had_description: |
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Canvas lined using vacuum hot table at 65°C.
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BEVA 371 adhesive between original and new linen canvas.
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Atmospheric pressure maintained for 30 minutes during cooling.
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includes_or_included:
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- has_or_had_type: StructuralRepairTechnique
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has_or_had_label: "Thread-by-thread tear mending"
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has_or_had_description: "Aligned torn threads and secured with wheat starch paste"
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description: Complex lining technique with sub-technique
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- value:
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has_or_had_type: XRayFluorescence
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has_or_had_label: "MA-XRF elemental mapping"
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has_or_had_description: |
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Macro X-ray fluorescence scanning to map elemental distribution.
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Bruker M6 Jetstream scanner, 50kV, 600μA.
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Scan area 67 x 60 cm at 650 μm resolution.
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Identified lead white, vermilion, yellow ochre, natural ultramarine.
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description: XRF examination technique from Operation Night Watch
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