The World Wide Web Consortium released “XHTML 1.0: The Extensible HyperText Markup Language (Second Edition)” as a W3C Recommendation. XHTML 1.0 is a reformulation of HTML in XML, giving the rigor of XML to Web pages. The second edition is not a new version; it brings the XHTML 1.0 Recommendation up to date with comments from the community, ongoing work within the HTML Working Group, and the first edition errata. The HTML Working Group has released the first public Working Draft of “XHTML 2.0.” XHTML 2.0 is a relative of the Web’s familiar publishing languages, HTML 4 and XHTML 1.0 and 1.1, and is not intended to be backward compatible with them. The draft contains the XHTML 2.0 markup language in modules for creating rich, portable Web-based applications. Comments are welcome.,