The English version of this specification is the only normative version. In particular, erratum [E09] relaxes the restrictions on element and attribute names, thereby providing in XML 1.0 the major end user benefit currently achievable only by using XML 1.1.
For the convenience of readers, an XHTML version with color-coded revision indicators is also provided; this version highlights each change due to an erratum published in the errata list for the previous edition, together with a link to the particular erratum in that list.
Most of the errata in the list provide a rationale for the change.
The errata list for this fifth edition is available at A Test Suite is maintained to help assessing conformance to this specification.
XML has been designed for ease of implementation and for interoperability with both SGML and HTML.
This section describes the status of this document at the time of its publication. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at
This document specifies a syntax created by subsetting an existing, widely used international text processing standard (Standard Generalized Markup Language, ISO 8886(E) as amended and corrected) for use on the World Wide Web.
It is a product of the XML Core Working Group as part of the XML Activity. As a convenience to readers, it incorporates the changes dictated by the accumulated errata (available at to the Fourth Edition of XML 1.0, dated 16 August 2006.
Please refer to the errata for this document, which may include some normative corrections.
The previous errata for this document, are also available. This document is also available in these non-normative formats: XML and XHTML with color-coded revision indicators.