Nested Context Language (NCL) is a declarative authoring language for hypermedia documents.
NCL is an XML application language, which provides several facilities for authoring a complete hypermedia document with synchronization relationships among its components. Among its main facilities, it treats hypermedia relations as first-class entities through the definition of hypermedia connectors, and it can specify arbitrary semantics for a hypermedia composition using the concept of composite templates.
Following others XML standards, NCL is specified by a modular approach. NCL modules can be added to standard web languages, such as XLink and SMIL.
NCL was initially designed for the Web environment, but currently it is included as the declarative language of the Japanese-Brazilian ISDB-Tb (International Standard for Digital Broadcasting) terrestrial DTV (digital TV) middleware (named Ginga). It is also the first standardized technology of the ITU-T multimedia application framework series of specifications for IPTV services. In both cases it is used to develop interactive applications to digital television.
Read more about Nested Context Language: NCL 3.0 Modules, Authoring Tools
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