namespace-uri() Function  
Returns the namespace URI of the first node in the argument node-set.
 
Inputs

A node-set. If the node-set is omitted, the namespace-uri() function creates a node-set that has the context node as its only member.
 
Output

The namespace URI of the first node in the argument node-set. If the argument node-set is empty, the first node has no namespace URI, or the first node has a namespace URI that is null, an empty string is returned. Be aware that the namespace-uri() function returns an empty string for all nodes other than element and attribute nodes.

 
Defined in

XPath section 4.1, Node Set Functions.

 
Example

Here is a stylesheet that uses the document() function to examine its own nodes and then invoke the namespace-uri() against each of them:

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:months="Lookup table for month names">

  <months:name sequence="01">January</months:name>
  <months:name sequence="02">February</months:name>
  <months:name sequence="03">March</months:name>
  <months:name sequence="04">April</months:name>
  <months:name sequence="05">May</months:name>
  <months:name sequence="06">June</months:name>
  <months:name sequence="07">July</months:name>
  <months:name sequence="08">August</months:name>
  <months:name sequence="09">September</months:name>
  <months:name sequence="10">October</months:name>
  <months:name sequence="11">November</months:name>
  <months:name sequence="12">December</months:name>

  <xsl:output method="text"/>

  <xsl:variable name="newline">
<xsl:text>
</xsl:text>
  </xsl:variable>

  <xsl:template match="/">
    <xsl:value-of select="$newline"/>
    <xsl:text>A test of the namespace-uri() function:</xsl:text>

    <xsl:value-of select="$newline"/>
    <xsl:value-of select="$newline"/>
    <xsl:for-each select="document('')//*">
      <xsl:text>namespace URI: </xsl:text>
      <xsl:value-of select="namespace-uri()"/>
      <xsl:value-of select="$newline"/>
    </xsl:for-each>
  </xsl:template>

</xsl:stylesheet>

Here are the results of our stylesheet:


A test of the namespace-uri() function:

namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: Lookup table for month names
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform
namespace URI: http://www.w3.org/1999/XSL/Transform