5. An apparatus according to claim 1 , wherein the metadata includes a plurality of annotations of the content data, the annotations including a first annotation generated by a first application and a second annotation generated by a second application.
5. An apparatus according to claim 1 , wherein the metadata includes a plurality of annotations of the content data, the annotations including a first annotation generated by a first application and a second annotation generated by a second application. 7. An apparatus according to claim 5 , wherein the processor is configured to update or delete the plurality of annotations upon receipt of a HTTP REST request.