The W3C Core Working group has published a proposed edited recommendation of XML 1.0, third edition. "This third edition is not a new version of XML. As a convenience to readers, it incorporates the changes dictated by the accumulated errata (available at http://www.w3.org/XML/xml-V10-2e-errata) to the Second Edition of XML 1.0, dated 6 october 2000. In addition, markup has been introduced on a significant portion of the prescriptions of the specification, clarifying when prescriptive keywords such as MUST, SHOULD and MAY are used in the formal sense defined in [IETF RFC 2119]."