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The standard known as XHTML5 is being developed as an XML adaptation of the HTML5 specification.The World Wide Web Consortium (W3C) also continues to maintain the HTML 4.01 Recommendation, and the specifications for HTML5 and XHTML5 are being actively developed.while at the same time updating the HTML specifications to address issues raised in the past few years." Ian Hickson, editor of the HTML5 specification criticising the improper use of XHTML in 2002, December 1998 saw the publication of a W3C Working Draft entitled Reformulating HTML in XML.This introduced Voyager, the codename for a new markup language based on HTML 4, but adhering to the stricter syntax rules of XML.Extensible Hypertext Markup Language (XHTML) is part of the family of XML markup languages.

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Modularization provides an abstract collection of components through which XHTML can be subsetted and extended.The first modular XHTML variants were XHTML 1.1 and XHTML Basic 1.0.In October 2008 Modularization of XHTML was superseded by XHTML Modularization 1.1, which adds an XML Schema implementation.The feature is intended to help XHTML extend its reach onto emerging platforms, such as mobile devices and Web-enabled televisions.The initial draft of Modularization of XHTML became available in April 1999, and reached Recommendation status in April 2001.

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