Test http://www.w3.org/2001/DOM-Test-Suite/level2/core/internalSubset01

<test name='internalSubset01' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-2 dom2.xsd'>
     <metadata>
          <title>internalSubset01</title>
          <creator>NIST</creator>
          <description> The "getInternalSubset()" method returns the internal subset as a string or null if there is none. This does not contain the delimiting brackets. Retrieve the documenttype. Apply the "getInternalSubset()" method. Null is returned since there is not an internal subset. </description>
          <contributor>Mary Brady</contributor>
          <date qualifier='created'>2001-07-02</date>
          <subject resource='http://www.w3.org/TR/DOM-Level-2-Core/core#ID-Core-DocType-internalSubset'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='docType' type='DocumentType'/>
     <var name='internal' type='DOMString'/>
     <load var='doc' href='staff2' willBeModified='false'/>
     <doctype obj='doc' var='docType'/>
     <internalSubset obj='docType' var='internal'/>
     <assertNull actual='internal' id='internalSubsetNull'/>
</test>

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