Variable and state handling in NCL

Authors:
Luiz Fernando Soares;Rogério Ferreira Rodrigues;Renato Cerqueira;Simone Diniz Barbosa
Affiliations:
Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, Brazil 22451-900;Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, Brazil 22451-900 and Microsoft® Corporation/FAST, a Microsoft® Subsidiary, Rio de Janeiro, Brazil 20090-003;Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, Brazil 22451-900;Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, Brazil 22451-900
Venue:
Multimedia Tools and Applications
Year:
2010

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Abstract

Most time-based declarative languages have limited support for variable definition and manipulation, which causes developers to resort to imperative languages. However, a declarative language should provide a variable handling model sufficiently rich to describe a wide range of interactive applications, avoiding, as much as possible, the help of an imperative scripting language. On the other hand, the declarative simplicity should not be lost, leaving for the imperative objects more complex manipulations, with the necessary care to avoid any impact in the application's temporal graph. Based on this principle, variables and the presentation state are handled by NCL and Ginga-NCL, as discussed in this paper. NCL is the declarative language of the Brazilian Terrestrial Digital TV System (SBTVD) supported by its middleware called Ginga. NCL and Ginga-NCL are part of ISDB standards and also of ITU-T Recommendations for IPTV services.