Factory method to construct filter that filters out all properties except
ones includes in set
Method called to determine whether property will be included
(if 'true' returned) or filtered out (if 'false' returned)
Filter implementation which defaults to filtering out unknown
properties and only serializes ones explicitly listed.
Set of property names to serialize.
Filter implementation which defaults to serializing all
properties, except for ones explicitly listed to be filtered out.
Set of property names to filter out.