Release Notes: Media (content) types were added to the URI template, allowing for versioning of resources without specifying an actual version in the URI. Existing resources default to "applicaton/xml" if no media type matches. Caches are now based on both URI and media/content type. The supplied representation builders were created and exposed for users of the framework. Media types will now also drive these (so you don't need ".xml", ".xsd", ".json", etc. at the end of a resource).