Tools for validating xml
This edition supersedes the previous W3C Recommendation of 16 August 2006.
Most of the errata in the list provide a rationale for the change.
XML is an application profile or restricted form of SGML, the Standard Generalized Markup Language [ISO 8879].
By construction, XML documents are conforming SGML documents.
The errata list for this fifth edition is available at A Test Suite is maintained to help assessing conformance to this specification.
This document has been reviewed by W3C Members, by software developers, and by other W3C groups and interested parties, and is endorsed by the Director as a W3C Recommendation.