Test http://www.w3.org/2001/DOM-Test-Suite/level2/core/prefix03

<test name='prefix03' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-2 dom2.xsd'>
     <metadata>
          <title>prefix03</title>
          <creator>NIST</creator>
          <description> The "getPrefix()" method for a node returns the namespace prefix of this node, or null if it is unspecified. Retrieve the first emp:employee node and invoke the getPrefix() method." The method should return "emp". </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-NodeNSPrefix'/>
</metadata>
     <implementationAttribute name='namespaceAware' value='true'/>
     <var name='doc' type='Document'/>
     <var name='elementList' type='NodeList'/>
     <var name='testEmployee' type='Node'/>
     <var name='prefix' type='DOMString'/>
     <load var='doc' href='staffNS' willBeModified='false'/>
     <getElementsByTagName interface='Document' obj='doc' tagname='"emp:employee"' var='elementList'/>
     <item interface='NodeList' obj='elementList' index='0' var='testEmployee'/>
     <assertNotNull actual='testEmployee' id='empEmployeeNotNull'/>
     <prefix obj='testEmployee' var='prefix'/>
     <assertEquals actual='prefix' expected='"emp"' id='prefix' ignoreCase='false'/>
</test>

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