•W3C
The World Wide Web Consortium (W3C) develops interoperable technologies (specifications, guidelines, software, and tools) to le
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•XHTML™ 1.0
The Extensible HyperText Markup Language (Second Edition). A Reformulation of HTML 4 in XML 1.0. W3C Recommendation 26 Januar
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•XML 1.1
Extensible Markup Language 1.1. W3C Recommendation 04 February 2004, edited in place 15 April 2004 - W3C-
447#9080SIBLINGSCHILDREN9080