|  | Level: Intermediate Contributors: W3C 06 Feb 2007
Updated 25 Apr 2007 xml:id provides a formal convention for attributes
expressing unique identifiers for elements in XML documents. Discover
how it avoids the pitfalls of Document Type Definition (DTD) ID types
while providing a refreshing simplicity.
Many XML applications require a mechanism to identify
elements. As an example, an ID on an XHTML element is used for linking
within a document -- and this is similar to how an anchor name within an
HTML document can be used for internal links. DTDs provide a mechanism
for asserting that an attribute is of ID type, but DTDs can be
problematic in that processors may not address them in all cases. A
variety of such complexities has made it difficult to express in a
general way which attributes are meant to have ID semantics.
xml:id
Version 1.0
[W3C Recommendation] is a simple specification
expressing the convention that any attribute named xml:id (the xml prefix
is always bound to the special XML namespace) is treated as a unique
identifier by compliant applications.
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