Test http://www.w3.org/2001/DOM-Test-Suite/level2/core/nodesetprefix06

<test name='nodesetprefix06' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-2 dom2.xsd'>
     <metadata>
          <title>nodesetprefix06</title>
          <creator>IBM</creator>
          <description> The method setPrefix raises a NAMESPACE_ERR if the specified prefix is "xml" and the namespaceURI of this node is different from "http://www.w3.org/XML/1998/namespace". Invoke the setPrefix method on this Element object with namespaceURI that is different from http://www..w3.org/xml/1998/namespace and a prefix whose values is xml. Check if the NAMESPACE_ERR was thrown. </description>
          <contributor>Neil Delima</contributor>
          <date qualifier='created'>2002-04-28</date>
          <subject resource='http://www.w3.org/TR/DOM-Level-2-Core/core#ID-NodeNSPrefix'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='element' type='Element'/>
     <load var='doc' href='staffNS' willBeModified='true'/>
     <createElementNS var='element' obj='doc' namespaceURI='"http://www.w3.org/DOM/Test/L2"' qualifiedName='"dom:elem"'/>
     <assertDOMException id='throw_NAMESPACE_ERR'>
          <NAMESPACE_ERR>
               <prefix obj='element' value='"xml"'/>
          </NAMESPACE_ERR>
     </assertDOMException>
</test>

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