{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://rig.works/schemas/rig.bim.relation.schema.json",
  "title": "rig.bim.relation",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "kind": {
      "type": "string",
      "enum": [
        "voids",
        "fills",
        "connects",
        "aggregates",
        "services"
      ]
    },
    "a": {
      "$ref": "./_defs.schema.json#/$defs/entity"
    },
    "b": {
      "$ref": "./_defs.schema.json#/$defs/entity"
    }
  },
  "required": [
    "kind",
    "a",
    "b"
  ]
}