Original Paper

Journal of the Brazilian Computer Society

, Volume 16, Issue 4, pp 229-245

Open Access This content is freely available online to anyone, anywhere at any time.

The Nested Context Language reuse features

  • Carlos de Salles Soares NetoAffiliated withDepartment of Informatics, Pontifical Catholic University of Rio de JaneiroDepartment of Informatics, Federal University of Maranhão Email author 
  • , Luiz Fernando Gomes SoaresAffiliated withDepartment of Informatics, Pontifical Catholic University of Rio de Janeiro
  • , Clarisse Sieckenius de SouzaAffiliated withDepartment of Informatics, Pontifical Catholic University of Rio de Janeiro

Abstract

NCL, the standard declarative language of the Brazilian Terrestrial Digital TV System and ITU-T Recommendation for IPTV Services, provides a high level of reuse in the design of hypermedia applications. In this paper we detail how its design and conceptual model have succeeded in supporting reuse at a declarative level. NCL supports not only static but also running code reuse. It also allows for reuse inside applications, reuse between applications, and reuse of code spans stored in external libraries. For a specification language to promote reuse, however, it must have a number of usability merits. Aspects of NCL usability are thus analyzed with the Cognitive Dimensions of Notation framework.

Keywords

Ginga-NCL DTV NCL SBTVD-T Middleware Code reuse Declarative programming Cognitive Dimensions of Notation