The WTVML markup language is a heavily extended superset of the WAP Forum WML 1.3 specification.
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The system is an Interactive television technology platform comprising a microbrowser, a markup language, and a significant collection of associated software tools and services.
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The WTVML microbrowser is currently available only as an OpenTV application, although an MHP version of the Waptv browser has been built for demonstration and proof of concept.
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TV Sites for the OpenTV based Microbrowser are therefore web sites with a WTVML skin, and are often given a "wtv." sub-domain rather than a "www." sub-domain.