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This enhances the functionality and interoperability of the Web.
W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent.
This edition supersedes the previous W3C Recommendation of 16 August 2006.
Please report errors in this document to the public [email protected] list; public archives are available.
Please refer to the errata for this document, which may include some normative corrections.
XML provides a mechanism to impose constraints on the storage layout and logical structure.
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.
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.
XML documents are made up of storage units called entities, which contain either parsed or unparsed data.