{
  "$id": "https://raw.githubusercontent.com/bcgov/nr-pies/refs/heads/main/docs/spec/element/message/linkage.schema.json",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Linkage",
  "description": "Represents a message asserting a linkage between specific assets.",
  "type": "object",
  "properties": {
    "asset_group": {
      "$ref": "https://raw.githubusercontent.com/bcgov/nr-pies/refs/heads/main/docs/spec/element/data/asset.schema.json"
    },
    "linked_asset_id": {
      "type": "string",
      "description": "The asset or primary key representing what asset is linked with the primary header asset."
    },
    "linked_asset_kind": {
      "type": "string",
      "description": "A valid Asset Kind code that specifies the precise type of asset is linked with the primary header asset.",
      "enum": ["ANCHOR", "PERMIT", "PROJECT"]
    },
    "linked_system_id": {
      "type": "string",
      "description": "A valid CSNR IT Service Management code identifying the originating source system, service, or asset.",
      "pattern": "^ITSM-\\d{4,5}$"
    },
    "relation_kind": {
      "type": "string",
      "description": "The kind of relation between the primary asset and the linked asset (for example, MERGES, RELATES, SELF, SPLITS).",
      "enum": ["MERGES", "RELATES", "SELF", "SPLITS"]
    }
  },
  "allOf": [
    {
      "$ref": "https://raw.githubusercontent.com/bcgov/nr-pies/refs/heads/main/docs/spec/element/data/header.schema.json"
    }
  ],
  "required": ["asset_group", "linked_asset_id", "linked_asset_kind", "linked_system_id", "relation_kind"]
}