document: Towards a multimedia formatting vocabulary Time-based , media-centric Web presentations can be described declaratively in the XML world through the development of languages such as SMIL . It is difficult , however , to fully integrate them in a complete document transformation processing chain . In order to achieve the desired processing of data-driven , time-based , media-centric presentations , the text-flow based formatting vocabularies used by style languages such as XSL , CSS and DSSSL need to be extended . The paper presents a selection of use cases which are used to derive a list of requirements for a multimedia style and transformation formatting vocabulary . The boundaries of applicability of existing text-based formatting models for media-centric transformations are analyzed . The paper then discusses the advantages and disadvantages of a fully-fledged time-based multimedia formatting model . Finally , the discussion is illustrated by describing the key properties of the example multimedia formatting vocabulary currently implemented in the back-end of our Cuypers multimedia transformation engine .
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