{
    "description": "List of keys of fields",
    "oneOf": [
        {
            "description": "Dot (.) indexed strings that specifies field keys",
            "type": "string"
        },
        {
            "description": "Array of keys that index a field",
            "items": {
                "pattern": "^[^\\.]*$",
                "type": "string"
            },
            "type": "array"
        }
    ],
    "title": "FieldType"
}