New facilities for presenting and authoring MPEG-4 documents

This paper proposes new features for presenting and authoring MPEG-4 programs using the NCL language. On one hand, the language allows to define relationships among objects inside an MPEG-4 scene and external media objects, including objects in other MPEG-4 scenes. Relationships with several different semantics will also be allowed other than those defined by the standard. An NCL hypermedia formatter integrated with MPEG-4 players supports these new introduced features. On the other hand, the paper also takes advantage of the NCL composite-node template concept, to add new authoring facilities when specifying MPEG-4 documents using the XMT-O language