No abstract

This paper proposes an incremental, structural and contextual validation method for Nested Context Language (NCL) documents. As part of the proposed method, we define a declarative metalanguage to ensure low coupling between NCL structure and the validator code, which simplifies the validation of new language profiles. Requirements such as incremental processing and multilingual messages are also covered by this work. We present an implementation of this method using component architecture as a proof of concept and also conduct a performance evaluation to compare the traditional and incremental validation approaches. Keywords NCL • Incremental validation • Code validation • Ginga • ISDB-Tb • iDTV This is an extended version of the paper "Método de Validação Estrutural e Contextual de Documentos NCL", presented as one of the Best Papers of Webmedia 2011 (Brazilian Symposium on Web and Hypermedia Systems).

This paper presents the concept of eventline as a visual representation proposal for the temporal behavior of multimedia applications. The main difference of this proposal when compared to the timeline paradigm is the replacement of the temporal continuous axis to a temporal discrete axis based on the occurrence of events. Media synchronization in each eventline is based on the relative time of a main media. User interaction is expressed as the navigation between multiple eventlines. The objective of this work is to provide a simplified alternative for authoring of interactive multimedia applications. RESUMOEste trabalho apresenta o conceito de eventline como proposta visual de representação do comportamento temporal de aplicações multimídia. Essa proposta é baseada na abstração timeline, sendo a principal diferença entre ambas a mudança da modelagem de um eixo temporal contínuo para um eixo temporal discreto baseado na ocorrência de eventos. A sincronização das mídias em cada eventline individualmente é pautada no tempo relativo de uma mídia principal e a interação do usuário é expressa pela navegação entre múltiplas eventlines. O objetivo deste trabalho é oferecer uma alternativa simplificada para a autoria de aplicações multimídia interativas.