{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/smithsonian/main/json-schema/smithsonian-collection-object-schema.json",
  "title": "Smithsonian Collection Object",
  "description": "Schema for a digitized Smithsonian collection object returned by the Open Access API.",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique identifier for the collection object.",
      "examples": ["edanmdm-nmaahc_2012.36.4ab"]
    },
    "title": {
      "type": "string",
      "description": "Title of the collection object."
    },
    "unitCode": {
      "type": "string",
      "description": "Code identifying the Smithsonian museum or research unit.",
      "examples": ["NMAAHC", "NMNH", "SAAM", "NASM", "NMAH", "NPG", "CHNDM", "HM", "FGA", "AAA", "ACAH", "CFCHFOLKLIFE", "FSG", "HAC", "NAA", "NMAI", "SIA", "NZPBIOLOGY", "STRI"]
    },
    "linkedId": {
      "type": "string",
      "description": "Linked identifier if the object is associated with another record."
    },
    "type": {
      "type": "string",
      "description": "Object type determining the content schema.",
      "enum": ["edanmdm", "ead_collection", "ead_component", "all"]
    },
    "url": {
      "type": "string",
      "description": "Canonical URL identifier for the object.",
      "examples": ["edanmdm:nmaahc_2012.36.4ab"]
    },
    "content": {
      "type": "object",
      "description": "Type-specific content metadata. Structure varies by object type.",
      "additionalProperties": true
    },
    "hash": {
      "type": "string",
      "description": "SHA-1 content hash of the record.",
      "pattern": "^[a-f0-9]{40}$"
    },
    "docSignature": {
      "type": "string",
      "description": "Document signature for integrity checking."
    },
    "timestamp": {
      "type": "integer",
      "description": "Unix timestamp when the record was created in the system.",
      "minimum": 0
    },
    "lastTimeUpdated": {
      "type": "integer",
      "description": "Unix timestamp when the record was last updated.",
      "minimum": 0
    },
    "version": {
      "type": "string",
      "description": "Version identifier string for the record."
    }
  },
  "required": ["id", "title", "unitCode", "type", "url"]
}