Creating a Semanticbased Discourse Model for Hypermedia Presentations: (Un)discovered Problems

We address the problem of building a flexible discourse model that enables creation of relatively complex discourse structures by using a semantic framework and semantic descriptions of media items. With such model we intend to support different approaches to hypermedia presentation authoring. We give a short overview of existing hypermedia presentation generation systems and discuss what type of authoring they support. We present our motivation for working towards a discourse model that improves on existing approaches. We describe in more detail our experiences with various strategies for building discourse structures for DISC and SampLe systems. Based on these experiences we come up with a set of requirements for a common discourse model