The Gdata Object Model describes an abstract object model for the gdata
protocol. GData is supposed to be very flexible and extensible. Users should
be able to extend {@link org.apache.lucene.gdata.gom.GOMFeed} and
{@link org.apache.lucene.gdata.gom.GOMEntry} elements to create extensions
and custom classes for their own model.
This interface describes the extensible GOM entities.
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