In case you need to process a JSON key before assigning it to a property use the below method. Let's say you get a JSON key as { "timeStamp" : "015-02-04T17:33:30.732+0000" } . Poor NativeObject does not know how to map the above String to an NSDate ( since the format is not specified ). In such cases, you might want to roll out your own implementation by overriding the below method, set a date formatter to the json value and return the computed propertyValue back.
 This applies for converting a propertyValue to JSON value as well.