if (result === undefined) {
            throw "readField: field '" + fieldName + "' not found on object named '" + objectName + "' with fields '" + Object.keys(group) + "'";
        } else {
            return result;
        }
    } else {
        console.log("readField: named object with field not found '" + objectName + '.' + fieldName + "'");
        return null;
    }
}