{
  "title": "search layer",
  "type": "object",
  "$schema": "http://json-schema.org/draft-04/schema",
  "description": "Layer configuration for search.",
  "properties": {
    "field": {
      "$ref": "search_layer_field_schema.json"
    },
    "id": {
      "type": "string",
      "description": "A string identifying the layer."
    },
    "subLayer": {
      "type": "integer",
      "description": "Optional index for a sublayer."
    }
  },
  "required": [
    "field",
    "id"
  ],
  "additionalProperties": false
}