Test http://www.w3.org/2001/DOM-Test-Suite/level2/core/namespaceURI04

<test name='namespaceURI04' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-2 dom2.xsd'>
     <metadata>
          <title>namespaceURI04</title>
          <creator>NIST</creator>
          <description> The "getNamespaceURI()" method for a Node returns the namespace URI of this node, or null if unspecified. Retrieve the second employee node and invoke the "getNamespaceURI()" method. The method should return "null". </description>
          <contributor>Mary Brady</contributor>
          <date qualifier='created'>2001-08-17</date>
          <subject resource='http://www.w3.org/TR/DOM-Level-2-Core/core#ID-NodeNSname'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='elementList' type='NodeList'/>
     <var name='testEmployee' type='Node'/>
     <var name='employeeNamespace' type='DOMString'/>
     <load var='doc' href='staffNS' willBeModified='false'/>
     <getElementsByTagName interface='Document' obj='doc' tagname='"employee"' var='elementList'/>
     <item interface='NodeList' obj='elementList' index='1' var='testEmployee'/>
     <namespaceURI obj='testEmployee' var='employeeNamespace'/>
     <assertNull actual='employeeNamespace' id='throw_Null'/>
</test>

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