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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.
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.
Moreover, beyond our own universe there might be an endless number of other universes bubbling into frothy eternity, like a pot of pasta water boiling over." Dr.
Kovac and his collaborators, working in an experiment known as Bicep, for Background Imaging of Cosmic Extragalactic Polarization, reported their results in a scientific briefing at the Harvard-Smithsonian Center for Astrophysics today and in a set of papers submitted to The Astrophysical Journal.
XML provides a mechanism to impose constraints on the storage layout and logical structure.
This signal would allow us to "look through the peephole after hearing the faint knock on the door," and verify that indeed "someone" is there.
As announced today, a team of astronomers led by John M. Kovac’s work "will stand as a landmark in science comparable to the recent discovery of dark energy pushing the universe apart, or of the Big Bang itself.
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