id: https://nde.nl/ontology/hc/class/measure-unit
name: measure_unit_class
title: MeasureUnit Class
description: 'Class representing a unit of measurement for quantities.

  **RULE 53 COMPLIANT**: Generic class for standardized unit representation, used by Area, Quantity, and other measurement classes.

  **ONTOLOGY ALIGNMENT**: - QUDT (Quantities, Units, Dimensions and Types) - schema:unitCode / schema:unitText - OM (Ontology of Units of Measure)'
prefixes:
  linkml: https://w3id.org/linkml/
  hc: https://nde.nl/ontology/hc/
  schema: http://schema.org/
  qudt: http://qudt.org/schema/qudt/
  om: http://www.ontology-of-units-of-measure.org/resource/om-2/
  dcterms: http://purl.org/dc/terms/
  prov: http://www.w3.org/ns/prov#
  crm: http://www.cidoc-crm.org/cidoc-crm/
  skos: http://www.w3.org/2004/02/skos/core#
  rdfs: http://www.w3.org/2000/01/rdf-schema#
  org: http://www.w3.org/ns/org#
  xsd: http://www.w3.org/2001/XMLSchema#
imports:
  - linkml:types
  - ../enums/MeasureUnitEnum
  - ../slots/has_or_had_code
  - ../slots/has_or_had_label
  - ../slots/has_or_had_symbol
  - ../slots/has_or_had_type
default_prefix: hc
classes:
  MeasureUnit:
    description: "A unit of measurement for expressing quantities.\nCaptures the unit type (from MeasureUnitEnum), symbol, and optional conversion factors. Used as the range for has_or_had_unit slot.\n**EXAMPLES**: - Hectare (ha) for outdoor site area - Square meter (m\xB2) for building floor area - Linear meter (m) for archival shelf extent"
    class_uri: qudt:Unit
    exact_mappings:
    - qudt:Unit
    - om:Unit
    close_mappings:
    - schema:unitCode
    slots:
    - has_or_had_type
    - has_or_had_symbol
    - has_or_had_code
    - has_or_had_label
    slot_usage:
      has_or_had_type:
        range: MeasureUnitEnum
        required: true
      has_or_had_symbol:
        range: string
        required: false
        examples:
        - value: ha
        - value: "m\xB2"
        - value: m
      has_or_had_code:
        range: string
        required: false
        examples:
        - value: har
        - value: m2
      has_or_had_label:
        range: string
        examples:
        - value: hectare
        - value: square meter
    examples:
    - value:
        has_or_had_type: HECTARE
        has_or_had_symbol: ha
        has_or_had_code: har
        has_or_had_label: hectare
    - value:
        has_or_had_type: SQUARE_METER
        has_or_had_symbol: "m\xB2"
        has_or_had_code: m2
        has_or_had_label: square meter
    - value:
        has_or_had_type: LINEAR_METER
        has_or_had_symbol: m
        has_or_had_code: m
        has_or_had_label: linear meter
    annotations:
      custodian_types: '["*"]'
      custodian_types_rationale: Measurement units applicable to all heritage custodian types.
      specificity_score: 0.3
      specificity_rationale: Foundational class - highly reusable across many contexts.