http://developers.de/blogs/damir_dobric/archive/2008/06/18/wcf-3-5-syndicationfeedformatter-and-uritemplate-samples.aspx  Example 1   [ ServiceContract ]   [ ServiceKnownType ( typeof ( Atom10FeedFormatter ) )]   [ ServiceKnownType ( typeof ( Rss20FeedFormatter ) )]   public interface IGpsService   {     [ OperationContractenCommunityServer 2008 SP1 (Build: 30619.63)