{
    "properties": {
        "objectIdFieldName": {
            "title": "field with object identifier ",
            "type": "string"
        },
        "objectIds": {
            "items": {
                "title": "object identifier",
                "type": "integer"
            },
            "title": "list of object identifiers",
            "type": "array"
        }
    },
    "title": "set of feature identifiers",
    "type": "object"
}