{
  "type": [
    "object",
    "null"
  ],
  "properties": {
    "referenceId": {
      "type": "string"
    },
    "matchOn": {
      "type": [
        "object",
        "null"
      ],
      "additionalProperties": {
        "type": [
          "string",
          "null"
        ]
      },
      "default": null
    }
  },
  "required": [
    "referenceId"
  ],
  "$id": "https://ruleforge-docs.onrender.com/schemas/reference-config.schema.json",
  "title": "Reference (multi-row lookup) config"
}