Composer: Ambiente de Autoria de Aplicações Declarativas para TV Digital Interativa

This paper presents Composer, an environment to support interactive program designs for the Brazilian Terrestrial Digital TV System. In Composer several abstractions are defined through using document views (structural, temporal, layout and textual). One of these views, the temporal view, preserves as much as possible the timeline paradigm, usually used in non-interactive TV program editions. Using this view, authoring can be done positioning media objects on a time axis, however, at the same time, preserving the relative relationships among these objects. Moreover, non-deterministic time events, like viewer interactions and content adaptation, can also be represented using the temporal view. Among other facilities provided by its four views, Composer also supports live program editing, that is, interactive- program editing during a program exhibition.