The Wayback Machine - https://web.archive.org/web/20101122162555/http://www.w3.org/1999/XSL/Transform

XSLT Namespace

The namespace name http://www.w3.org/1999/XSL/Transform identifies elements which serve as instructions in the XSLT language.

Specifications

XSLT language has two versions which are distinguished by content of the version attribute:

A Working Draft of the version 2.1 of the language, currently in development, is available at http://www.w3.org/TR/xslt-21/