11. The method of claim 9 wherein the invalid element specifies the fragment identification.
9. A method implemented by a provider in a broadcasting system for managing metadata for multimedia program content scheduled for broadcast in the broadcasting system, the method comprising: receiving by the provider from a client device in the broadcasting system a request for updating a lower fragment containing metadata related to the scheduled multimedia program content, the client device storing the lower fragment in a previously received electronic document, wherein the electronic document has a hierarchical structure based on a prescribed syntax and the hierarchical structure includes an upper fragment located above the lower fragment which is identified by a fragment identification; and in response to the request, sending from the provider to the client device an update document having a structure based on the prescribed syntax, the update document including the upper fragment and an invalid element, wherein the invalid element specifies that information in the lower fragment is invalid.