{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "urn:tmpa:schema:governance-object:s0.4",
  "title": "TMPA Governance Object S0.4",
  "$comment": "Structural validation does not establish role authority, lifecycle legality, cross-object uniqueness, or integrity verification.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "tmpa_version",
    "id",
    "type",
    "governed_work",
    "stream",
    "creator",
    "role",
    "created_at",
    "lifecycle",
    "references",
    "content",
    "integrity"
  ],
  "properties": {
    "tmpa_version": { "const": "S0.4" },
    "id": { "type": "string", "minLength": 1 },
    "type": { "type": "string", "minLength": 1 },
    "governed_work": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "primary_carrier_id"],
      "properties": {
        "id": { "type": "string", "minLength": 1 },
        "primary_carrier_id": { "type": "string", "minLength": 1 }
      }
    },
    "stream": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "sequence"],
      "properties": {
        "id": { "type": "string", "minLength": 1 },
        "sequence": { "type": "integer", "minimum": 1 }
      }
    },
    "creator": { "type": "string", "minLength": 1 },
    "role": { "type": "string", "minLength": 1 },
    "created_at": { "type": "string", "format": "date-time" },
    "lifecycle": {
      "type": "object",
      "additionalProperties": false,
      "required": ["profile", "state"],
      "properties": {
        "profile": { "type": "string", "minLength": 1 },
        "state": { "type": "string", "minLength": 1 },
        "transition": {
          "type": "object",
          "additionalProperties": false,
          "required": ["from", "action", "to"],
          "properties": {
            "from": { "type": "string", "minLength": 1 },
            "action": { "type": "string", "minLength": 1 },
            "to": { "type": "string", "minLength": 1 }
          }
        }
      }
    },
    "references": {
      "type": "array",
      "uniqueItems": true,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["relation", "target"],
        "properties": {
          "relation": { "type": "string", "minLength": 1 },
          "target": { "type": "string", "minLength": 1 }
        }
      }
    },
    "content": {
      "type": "object",
      "additionalProperties": false,
      "required": ["media_type", "body"],
      "properties": {
        "media_type": { "type": "string", "minLength": 1 },
        "body": {}
      }
    },
    "integrity": {
      "type": "object",
      "additionalProperties": false,
      "required": ["canonicalization", "hash_algorithm", "digest"],
      "dependentRequired": {
        "signature_algorithm": ["key_id", "signature"],
        "key_id": ["signature_algorithm", "signature"],
        "signature": ["signature_algorithm", "key_id"]
      },
      "properties": {
        "canonicalization": { "type": "string", "minLength": 1 },
        "hash_algorithm": { "type": "string", "minLength": 1 },
        "digest": { "type": "string", "minLength": 1 },
        "signature_algorithm": { "type": ["string", "null"] },
        "key_id": { "type": ["string", "null"] },
        "signature": { "type": ["string", "null"] }
      },
      "oneOf": [
        {
          "properties": {
            "signature_algorithm": { "type": "null" },
            "key_id": { "type": "null" },
            "signature": { "type": "null" }
          }
        },
        {
          "required": ["signature_algorithm", "key_id", "signature"],
          "properties": {
            "signature_algorithm": { "type": "string", "minLength": 1 },
            "key_id": { "type": "string", "minLength": 1 },
            "signature": { "type": "string", "minLength": 1 }
          }
        }
      ]
    },
    "extensions": {
      "type": "object",
      "additionalProperties": true
    }
  }
}