.. _namespace-uri-from-QName:

========================
namespace-uri-from-QName
======================== 

The namespace part of a QName

Description
~~~~~~~~~~~
The fn:namespace-uri-from-QName function returns the namespace part of an 
xs:QName. If you want to retrieve the namespace of an element or attribute name, 
you should consider using the fn:namespace-uri function instead; you cannot pass 
element or attribute nodes directly to this function.

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   * - **Parameters**
     - **Description**
   * - arg:string()
     - 

Examples
~~~~~~~~
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   * - **XPath**
     - **Results**
   * - namespace-uri-from-QName(QName ('http://datypic.com/pre', 'prefixed'))
     - http://datypic.com/pre
   * - namespace-uri-from-QName(QName ('', 'unprefixed'))
     - zero-length xs:anyURI value
   * - namespace-uri-from-QName( () )
     - ()

See Also
~~~~~~~~

.. toctree::
   :titlesonly:
   :glob:

* :ref:`local-name-from-QName`.
* :ref:`resolve-QName`.
* :ref:`namespace-uri`.
* :ref:`namespace-uri-for-prefix`.