{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "http://product-information-graph.org/schema/2026-05-08/jsonld/Property.json",
  "title": "CASCaRA Property Schema for JSON-LD",
  "description": "Validates Property class definitions that specify attributes for entities and relationships. May include datatype specifications (string, integer, double, boolean, dateTime, etc.), cardinality constraints (sh:minCount, sh:maxCount, value constraints (sh:minInclusive, sh:maxInclusive, sh:maxLength, sh:pattern), default values, measurement units, and support for composed properties.",
  "type": "object",
  "properties": {
    "@id": {
      "$ref": "#/$defs/idString"
    },
    "@type": {
      "type": "string",
      "enum": [ "owl:DatatypeProperty" ]
    },
    "cas:specializes": {
      "$ref": "#/$defs/idObject"
    },
    "cas:itemType": {
      "type": "object",
      "required": [
        "@id"
      ],
      "properties": {
        "@id": {
          "type": "string",
          "enum": [ "cas:Property" ],
          "description": "The CASCaRA metamodel item type for cas:Property"
        }
      },
      "additionalProperties": false
    },
    "cas:revision": {
      "type": "string",
      "description": "Revision identifier for version control"
    },
    "cas:priorRevision": {
      "type": "array",
      "description": "Array of prior revision identifiers",
      "maxItems": 2,
      "items": {
        "type": "string"
      }
    },
    "dcterms:modified": {
      "type": "string",
      "format": "date-time",
      "description": "ISO 8601 timestamp of last modification"
    },
    "dcterms:creator": {
      "type": "string",
      "description": "Creator/author of this relationship instance"
    },
    "dcterms:title": {
      "type": "array",
      "minItems": 1,
      "items": {
        "$ref": "#/$defs/languageValue"
      }
    },
    "dcterms:description": {
      "type": "array",
      "minItems": 1,
      "items": {
        "$ref": "#/$defs/languageValue"
      }
    },
    "skos:definition": {
      "type": "array",
      "minItems": 1,
      "items": {
        "$ref": "#/$defs/languageValue"
      }
    },
    "sh:datatype": {
      "$ref": "#/$defs/idObject"
    },
    "sh:minCount": {
      "type": "integer",
      "minimum": 0
    },
    "sh:maxCount": {
      "type": "integer",
      "minimum": 1
    },
    "sh:maxLength": {
      "type": "integer",
      "minimum": 1
    },
    "sh:minInclusive": {
      "type": "number"
    },
    "sh:maxInclusive": {
      "type": "number"
    },
    "sh:pattern": {
      "type": "string",
      "description": "Regular expression pattern for string validation"
    },
    "cas:unit": {
      "type": "string",
      "description": "Unit of measurement (SI unit)"
    },
    "sh:defaultValue": {
      "type": "string",
      "description": "Default value for this property"
    },
    "cas:composedProperty": {
      "type": "array",
      "description": "References to other properties that compose this property",
      "items": {
        "$ref": "#/$defs/idObject"
      }
    }
  },
  "required": [
    "@id",
    "@type",
    "cas:itemType",
    "dcterms:title"
  ],
  "additionalProperties": false,
  "$defs": {
    "idString": {
      "type": "string",
      "pattern": "^(?:[A-Za-z_][A-Za-z0-9_-]*:[^:\\s]+|https?://[^\\s]+)$",
      "description": "A valid ID string: either a namespaced identifier (prefix:name) or a URL"
    },
    "idObject": {
      "type": "object",
      "required": [
        "@id"
      ],
      "properties": {
        "@id": {
          "$ref": "#/$defs/idString"
        }
      },
      "additionalProperties": false,
      "description": "JSON-LD ID object wrapper"
    },
    "languageValue": {
      "type": "object",
      "required": [
        "@value"
      ],
      "properties": {
        "@value": {
          "type": "string",
          "minLength": 1,
          "description": "The actual text content"
        },
        "@language": {
          "type": "string",
          "pattern": "^[a-z]{2}(-[A-Z]{2})?$",
          "description": "IETF language tag (e.g., 'en', 'de', 'en-US')"
        }
      },
      "additionalProperties": false,
      "description": "Multi-language text value with optional language tag"
    }
  }
}