Describes mathematical notation and capturing both its structure and content. (W3C Recommendation 21 February 2001)

W3C Recommendation, revision of 7 July 1999.

A data model for describing information organization structures (metadata) for collections of networked information.

A methodology for the modularization of XHTML using XML Schema. It allows document authors to modify and extend XHTML in a conformant way.

CSS3 working draft for multi-column layout. [Not final specification]

XML namespaces provide a simple method for qualifying element and attribute names used in Extensible Markup Language documents by associating them with namespaces identified by URI references. (W3C Recommendation 14 January 1999)

Provided as a way for vendors and page authors to test their browser's conformance to the CSS1 specification.

A vocabulary used for describing software packages and their dependencies. It is intended to be useful in automated software distribution environments.

SGML links at the W3C, meant for use in reviews of the HTML specification.

Enables Web sites to express their privacy practices in a standard format that can be retrieved automatically and interpreted easily by user agents.