{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://concert.foundation/signet/v0.1/policy.schema.json",
  "title": "Policy",
  "description": "A machine-readable, human-auditable rule. Rules-as-code.",
  "type": "object",
  "required": [
    "id",
    "policyType",
    "expressionLanguage",
    "expression",
    "humanReadable",
    "version",
    "issuedBy"
  ],
  "additionalProperties": false,
  "properties": {
    "@context": {
      "type": [
        "string",
        "object",
        "array"
      ]
    },
    "type": {
      "const": "Policy"
    },
    "id": {
      "$ref": "definitions.schema.json#/definitions/Identifier"
    },
    "policyType": {
      "type": "string",
      "enum": [
        "eligibility",
        "evaluation",
        "approval",
        "constraint",
        "compliance"
      ]
    },
    "expressionLanguage": {
      "type": "string",
      "description": "e.g. rego, dmn, cel."
    },
    "expression": {
      "type": "string",
      "description": "The executable rule."
    },
    "humanReadable": {
      "type": "string",
      "description": "Plain-language statement of the same rule. MANDATORY."
    },
    "version": {
      "type": "string"
    },
    "issuedBy": {
      "$ref": "definitions.schema.json#/definitions/Identifier"
    }
  }
}