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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.