XML namespace: Difference between revisions

Revision as of 18:50, 13 January 2015

Revision as of 19:21, 18 February 2015

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Different specifications have taken different approaches on how namespace information is presented to applications.

Nearly all programming models allow the name of an element or attribute node to be retrieved as a three-part name: the local name, the namespace prefix, and the namespace URI. Applications should avoid attaching any significance to the choice of prefix, but the information is provided because it can be helpful to human readers. Names are considered equal, if the namespace URI and local name match.

In addition, most models provide some way of determining which namespaces have been declared for a given element. This information is needed because some XML vocabularies allow qualified names (containing namespace prefixes) to appear in the content of elements or attributes, as well as in their names. There are three main ways this information can be provided: