XHTML

From MDC

XHTML is to XML as HTML is to SGML. That is, XHTML is a markup language that is similar to HTML, but with a stricter syntax. Two versions of XHTML have been completed by the W3C:

• XHTML 1.0 is HTML4 reformulated as an XML application, and is backwards-compatible with HTML in limited cases
• XHTML 1.1 is a modular version of XHTML that is not backwards-compatible with HTML.

A third version, XHTML 2, with significant changes to the element vocabulary, is currently being developed.

For more information on XHTML, see:

• Wikipedia's XHTML article
• Sending XHTML as text/html considered harmful

[edit] Tools

• Markup validation service (W3C)
• Standards-Compliant Authoring Tools

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