Test http://www.w3.org/2001/DOM-Test-Suite/level1/core/nodeprocessinginstructionsetnodevalue

<test name='nodeprocessinginstructionsetnodevalue' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-1 dom1.xsd'>
     <metadata>
          <title>nodeProcessingInstructionSetNodeValue</title>
          <creator>Curt Arnold</creator>
          <description> Setting the nodeValue should change the value returned by nodeValue and ProcessingInstruction.getData. </description>
          <date qualifier='created'>2001-10-21</date>
          <subject resource='http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core#ID-F68D080'/>
          <subject resource='http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core#ID-1004215813'/>
          <subject resource='http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core#ID-837822393'/>
          <subject resource='http://www.w3.org/Bugs/Public/show_bug.cgi?id=181'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='testList' type='NodeList'/>
     <var name='piNode' type='Node'/>
     <var name='piValue' type='DOMString'/>
     <load var='doc' href='staff' willBeModified='true'/>
     <childNodes obj='doc' var='testList'/>
     <item interface='NodeList' obj='testList' index='0' var='piNode'/>
     <nodeValue obj='piNode' value='"Something different"'/>
     <nodeValue obj='piNode' var='piValue'/>
     <assertEquals actual='piValue' expected='"Something different"' id='nodeValue' ignoreCase='false'/>
     <data interface='ProcessingInstruction' obj='piNode' var='piValue'/>
     <assertEquals actual='piValue' expected='"Something different"' id='data' ignoreCase='false'/>
</test>

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