Test http://www.w3.org/2001/DOM-Test-Suite/level3/core/nodegetuserdata05

<test name='nodegetuserdata05' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-3 dom3.xsd'>
     <metadata>
          <title>nodegetuserdata05</title>
          <creator>IBM</creator>
          <description> Invoke setUserData on this Entity node to set this its UserData to a new Attr node and using getUserData with an invalid Key check if the returned UserData object is Null. </description>
          <contributor>Neil Delima</contributor>
          <date qualifier='created'>2002-06-10</date>
          <subject resource='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core#Node3-getUserData'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='docType' type='DocumentType'/>
     <var name='entities' type='NamedNodeMap'/>
     <var name='entity' type='Entity'/>
     <var name='attr' type='Attr'/>
     <var name='userData' type='DOMUserData'/>
     <var name='retUserData' type='DOMUserData'/>
     <var name='nullHandler' type='UserDataHandler' isNull='true'/>
     <var name='prevUserData' type='DOMUserData'/>
     <load var='doc' href='hc_staff' willBeModified='false'/>
     <doctype var='docType' obj='doc'/>
     <entities var='entities' obj='docType'/>
     <getNamedItem var='entity' obj='entities' name='"delta"'/>
     <createAttributeNS var='attr' obj='doc' namespaceURI='"http://www.w3.org/XML/1998/namespace"' qualifiedName='"lang"'/>
     <setUserData obj='entity' var='prevUserData' key='"key"' data='attr' handler='nullHandler'/>
     <getUserData var='retUserData' obj='entity' key='"Key"'/>
     <assertNull actual='retUserData' id='nodegetuserdata05'/>
</test>

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