What are the advantages of using XHTML rather than HTML?

If your document is just pure XHTML 1.0 (not including other markup languages) then you will not yet notice much difference. However as more and more XML tools become available, such as XSLT for tranforming documents, you will start noticing the advantages of using XHTML. XForms for instance will allow you to edit XHTML documents (or any other sort of XML document) in simple controllable ways.

Semantic Web applications will be able to take advantage of XHTML documents. If your document is more than XHTML 1.0, for instance including MathML, SMIL, or SVG, then the advantages are immediate: you can't do that sort of thing with HTML. More.

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