{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://bpa.local/schemas/evidence-link/v1alpha1",
  "title": "BPA Evidence Link v1alpha1",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "apiVersion",
    "kind",
    "linkId",
    "evidenceId",
    "runId",
    "nodeExecutionId",
    "relation",
    "sourceIds",
    "createdAt"
  ],
  "properties": {
    "apiVersion": { "const": "bpa.evidence/v1alpha1" },
    "kind": { "const": "EvidenceLink" },
    "linkId": { "$ref": "#/$defs/id" },
    "evidenceId": { "$ref": "#/$defs/id" },
    "runId": { "$ref": "#/$defs/id" },
    "nodeExecutionId": { "$ref": "#/$defs/id" },
    "relation": {
      "enum": [
        "captures",
        "supports",
        "contradicts",
        "derived_from",
        "references"
      ]
    },
    "sourceIds": {
      "type": "array",
      "minItems": 1,
      "maxItems": 100,
      "uniqueItems": true,
      "items": { "$ref": "#/$defs/id" }
    },
    "assetIds": {
      "type": "array",
      "minItems": 1,
      "maxItems": 100,
      "uniqueItems": true,
      "items": { "$ref": "#/$defs/id" }
    },
    "claimRef": { "$ref": "#/$defs/id" },
    "createdAt": { "$ref": "#/$defs/timestamp" }
  },
  "$defs": {
    "id": {
      "type": "string",
      "minLength": 1,
      "maxLength": 200,
      "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]*$"
    },
    "timestamp": { "type": "string", "format": "date-time" }
  }
}