IMPROVING THE EXPRESSIVENESS OF XML-BASED HYPERMEDIA AUTHORING LANGUAGES

摘要

This paper presents some desirable requirements for hypermedia authoring declarative languages, discussing which ones are satisfied by existent languages, such as SMIL, and which facilities are not offered. It also presents how the missing requirements could be offered in an XML-based language, in order to improve its expressiveness, presenting elements and attributes that could be incorporated in its DTD. Among the facilities, we can highlight the possibility for reusing document components and their presentation characteristics, offering flexibility in temporal duration specifications, adapting a document presentation according to user navigation, and specifying n-ary relationships expressing causality or constraint among components.