id: https://nde.nl/ontology/hc/class/CalendarSystem
name: CalendarSystem
title: Calendar System Class
description: >-
  Represents a temporal reference system (calendar) for dating events.
  
  **OWL TIME ALIGNMENT**: Maps to time:TRS (Temporal Reference System).
  
  **SUPPORTED SYSTEMS**:
  - gregorian: Gregorian calendar (ISO 8601 default)
  - julian: Julian calendar (pre-1582 dates)
  - hebrew: Hebrew calendar
  - islamic: Islamic (Hijri) calendar
  - chinese: Chinese traditional calendar
  - japanese: Japanese imperial calendar
  
  **USE CASES**:
  - Historical dates using Julian calendar
  - Religious dates in Hebrew or Islamic calendars
  - East Asian historical dates

prefixes:
  linkml: https://w3id.org/linkml/
  hc: https://nde.nl/ontology/hc/
  time: http://www.w3.org/2006/time#
  schema: http://schema.org/

default_prefix: hc

imports:
  - linkml:types
  - ../slots/has_or_had_label
  - ./Label

classes:
  CalendarSystem:
    class_uri: time:TRS
    description: >-
      A temporal reference system (calendar) used for dating.
    exact_mappings:
      - time:TRS
    close_mappings:
      - schema:Thing
    attributes:
      system_code:
        range: string
        required: true
        description: >-
          Code for the calendar system (e.g., gregorian, julian, hebrew, islamic).
        examples:
          - value: "gregorian"
          - value: "julian"
          - value: "hebrew"
          - value: "islamic"
      system_name:
        range: string
        description: >-
          Full name of the calendar system.
        examples:
          - value: "Gregorian Calendar"
          - value: "Julian Calendar"
          - value: "Hebrew Calendar"
      system_uri:
        range: uriorcurie
        description: >-
          URI identifying the calendar system standard.
        examples:
          - value: "http://www.opengis.net/def/trs/BIPM/0/Gregorian"
    slots:
      - has_or_had_label
    slot_usage:
      has_or_had_label:
        range: Label
        inlined: true
        description: Human-readable label for the calendar system.
    examples:
      - value:
          system_code: "gregorian"
          system_name: "Gregorian Calendar"
          system_uri: "http://www.opengis.net/def/trs/BIPM/0/Gregorian"
        description: Standard Gregorian calendar (ISO 8601)
      - value:
          system_code: "julian"
          system_name: "Julian Calendar"
        description: Julian calendar for pre-1582 dates
      - value:
          system_code: "hebrew"
          system_name: "Hebrew Calendar"
        description: Hebrew calendar for Jewish dates
    annotations:
      custodian_types: '["*"]'
      specificity_score: 0.5
      specificity_rationale: >-
        Moderately specific - calendar systems used in temporal context across heritage.