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it is a metalanguage, which enables one to write a Document Type Definition (DTD) and define the rules of the language so the document can be interpreted by the document receiver .
much of Internet access could be carried out on non-PC platforms such as palm computers, televisions, automobiles, telephones, etc.
In most cases these devices will not have the computing power of a desktop computer, and will not be designed to accommodate ill-formed HTML as do current browsers (bloated with code to handle sloppy or proprietary HTML).
XHTML 1.1 - Module-based XHTML (Recommendation since May 2001)
While XHTML 1.1 looks very similar to XHTML 1.0 Strict, it is designed to serve as the basis for future extended XHTML Family document types, and its modular design makes it easier to add other modules as needed or integrate itself into other markup languages.
XHTML 2.0 (first working draft – August 2002)
XHTML 2.0 is a markup language intended for rich, portable web-based applications. While the ancestry of XHTML 2.0 comes from HTML 4, XHTML 1.0, and XHTML 1.1, it is not intended to be backward compatible with its earlier versions.