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

<test name='nodeprocessinginstructionnodevalue' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-1 dom1.xsd'>
     <metadata>
          <title>nodeProcessingInstructionNodeValue</title>
          <creator>NIST</creator>
          <description> The string returned by the "getNodeValue()" method for a Processing Instruction Node is the content of the Processing Instruction(exclude the target). Retrieve the Processing Instruction node in the XML file and check the string returned by the "getNodeValue()" method. It should be equal to "PIDATA". </description>
          <contributor>Mary Brady</contributor>
          <date qualifier='created'>2001-08-17</date>
          <subject resource='http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core#ID-F68D080'/>
</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='false'/>
     <childNodes obj='doc' var='testList'/>
     <item interface='NodeList' obj='testList' index='0' var='piNode'/>
     <nodeValue obj='piNode' var='piValue'/>
     <assertEquals actual='piValue' expected='"PIDATA"' id='value' ignoreCase='false'/>
</test>

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