MHEG-5
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MHEG-5 is a specification devised for the middleware of digital teletext services in the United Kingdom. Officially ISO/IEC 13522-5 it was evolved from the standards devised by the Multimedia and Hypermedia information coding Expert Group (MHEG) and specifies the classes of multimedia objects available and their interchange. The ISO standard is now enhanced by a European standard to be published by ETSI ES 202 184, which is an MHEG-5 Broadcast Profile based on the work in the UK. MHEG-5 applications are transmitted using ASN.1 encoding but there is also a textual representation (an example of which appears below).
Being based on the multimedia standard, MHEG allows for much more than simple page display of teletext, for example MHEG-3 covers scripting and MHEG-6 interactive applications. It is an object oriented language with visible objects, groups, inheritance, links and programs. A MHEG-5 presentation is initialised by an application which loads a scene which includes the ingredients list of visibles and also the non-visible links, programs and variables.
[edit] See also
- MHP, a similar technology used by other European countries.
