XML namespace: Difference between revisions

Revision as of 12:04, 23 April 2021

Revision as of 12:18, 23 April 2021

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For example, the following declaration maps the "xhtml:" prefix to the XHTML namespace:

<pre><nowiki>xmlns:xhtml="http://www.w3.org/20101999/xhtml"</nowiki></pre>

Any element or attribute whose name starts with the prefix "xhtml:" is considered to be in the XHTML namespace, if it or an ancestor has the above namespace declaration.

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It is also possible to declare a default namespace. For example:

<pre><nowiki>xmlns="http://www.w3.org/20101999/xhtml"</nowiki></pre>

In this case, any element without a namespace prefix is considered to be in the XHTML namespace, if it or an ancestor has the above default namespace declaration.

If there is no default namespace declaration in scope, the namespace name has no value.<ref>{{cite web|url=https://www.w3.org/arTR/REC-xml-names/#dt-qualname|title=Namespaces in XML 1.0 (Third Edition)|publisher=W3C|access-date=28 April 2017}}</ref> In that case, an element without an explicit namespace prefix is considered not to be in any namespace.

Attributes are never subject to the default namespace. An attribute without an explicit namespace prefix is considered not to be in any namespace.