SEPIA

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Abstract
In this paper, we report about the design, development, and implementation of the SEPIA cooperative hyper- media authoring environment. It provides results on the following aspects of SEPIA: persistent and shared data storage, hypermedia data model with composites, so- phisticated and comprehensive authoring functionality, support for a new rhetoric and for cooperative work. We start by identifying the challenge of hypermedia author- ing and production which serves as the driving force for our development. Using interacting problem spaces as the vehicle for modelling the dynamic aspects of author- ing, we arrive at a set of requirements answered by the concept of "activity spaces". The design of coherent hy- perdocuments is facilitated by our "construction kit". Furthermore, we describe the extensions and modifica- tions necessary to support multiple authors with the cooperative version of SEPIA. The central issue of the paper is the system architecture and its implementation. We describe the basis for access to shared hyperdocu- ments, the activity space browsers, the integration of multimedia functionality (audio, graphics, pictures), and the integration of a video conferencing system.

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