In this paper, we present an analysis of existing multimedia document formats and models in view of the Cardio-OP project requirements. Since each of these models lacks some significant concepts and does not meet all of the requirements, we propose a new approach for the semantic modelling of multimedia content, which we implement on the basis of an object-relational database system. The approach taken in the project allows for fine grained representation and retrieval of structures and layout of multimedia material, for flexible, on-the-fly composition of multimedia fragments in order to create individualized multimedia documents, and for the realization of adaptation and personalization of multimedia presentations depending on the user environment specified by means of user profiles.

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