Open Access

The Nested Context Language reuse features

  • Carlos de Salles Soares Neto1, 2Email author,
  • Luiz Fernando Gomes Soares1 and
  • Clarisse Sieckenius de Souza1
Journal of the Brazilian Computer Society201016:17

Received: 8 December 2009

Accepted: 16 July 2010

Published: 21 August 2010


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.


Ginga-NCLDTVNCLSBTVD-TMiddlewareCode reuseDeclarative programmingCognitive Dimensions of Notation