W3C

xml:id Current Status

This page summarizes the relationships among specifications, whether they are finished standards or drafts. Below, each title links to the most recent version of a document.

Completed Work

W3C Recommendations have been reviewed by W3C Members, by software developers, and by other W3C groups and interested parties, and are endorsed by the Director as Web Standards. Learn more about the W3C Recommendation Track.

Group Notes are not standards and do not have the same level of W3C endorsement.

Standards

2005-09-09

xml:id Version 1.0

This document defines the meaning of the attribute xml:id as an ID attribute in XML documents and defines processing of this attribute to identify IDs in the absence of validation, without fetching external resources, and without relying on an internal subset.

Obsolete Specifications

These specifications have either been superseded by others, or have been abandoned. They remain available for archival purposes, but are not intended to be used.

Retired

2003-08-06

xml:id Requirements

Since XML 1.0, the ability of processors to identify an XML element by an explicit identifier ("IDness") has depended upon validation. Both DTDs and [XML Schema] have mechanisms to identify the structures containing unique identifiers. But neither XML Schema nor DTDs are required by all processors. A common processor type does not perform validation, nor fetch external resources for the purpose of acertaining whether the document contains unique identifiers.

This document sets out the requirements for a mechanism for determining "IDness" applicable to all classes of XML processors.