.. _namespace-uri-for-prefix:

========================
namespace-uri-for-prefix
======================== 

The namespace associated with a prefix, in the scope of an element

Description
~~~~~~~~~~~
The fn:namespace-uri-for-prefix function returns the namespace mapped to 
$prefix, using the in-scope namespaces of $el e ment. If $prefix is a 
zero-length string or the empty sequence, the function returns the default 
namespace, if any.

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   :header-rows: 1

   * - **Parameters**
     - **Description**
   * - prefix:string()
     - the prefix to check for
   * - element:element()
     - the element to use as the scope

Examples
~~~~~~~~
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   :widths: 50 50
   :header-rows: 1

   * - **XPath**
     - **Results**
   * - namespace-uri-for-prefix('', $in-xml)
     - ()
   * - namespace-uri-for-prefix('pre',$in-xml)
     - ()
   * - namespace-uri-for-prefix('pre',$in-xml//pre:prefixed)
     - http://datypic.com/pre
   * - namespace-uri-for-prefix(   '',$in-xml//unpre:unprefixed)
     - http://datypic.com/unpre
   * - namespace-uri-for-prefix(   'pre',$in-xml//unpre:unprefixed)
     - http://datypic.com/pre

See Also
~~~~~~~~

.. toctree::
   :titlesonly:
   :glob:

* :ref:`in-scope-prefixes`.
* :ref:`functx_namespaces-in-use`.
* :ref:`resolve-QName`.
* :ref:`namespace-uri`.
* :ref:`namespace-uri-from-QName`.