The Scalable Vector Graphics format SVG is already substantially improving graphics delivery on the web, but some important issues still remain to be addressed. In particular, SVG does not support client-side adaption of documents to different viewing conditions, such as varying screen sizes, style preferences or different device capabilities. Based on our earlier work we show how SVG can be extended with constraint-based specification of document layout to augment it with adaptive capabilities. The core of our proposal is to include one-way constraints into SVG, which offer more expressiveness than the previously suggested class of linear constraints and at the same time require substantially less computational effort.

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b thispaper, we present the main rdts we have ob tained through our &xTtience in designing ~d implementing JIadeus, ~authoring and presentation tool for interactive mtitimedia documents.This system do= an ~cient support for the spetimtion of temporal scenarios and fits in m artitecture that Mom the btegration of both authoring ad presentation phases of mtititnefia do~ertts.lloreover, we show that constrtits are wd suited for the devdoprnent of both end-user graphic interfxes and &cient low-levd mewtion mechanisms.I 1 .. ... ...

The paper discusses the interface needs for the emergence of new authoring tools for the creation of multimedia documents. We think that it is possible to break down the specify-and-run process of most existing tools to have more direct editing functions close to a "wysiwyg" approach. After identifying the requirements of direct editing for multimedia documents, we describe an authoring environment based on a set of synchronized views and we illustrate its usefulness through many authoring situations.