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

<test name='entitygetpublicidnull' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-1 dom1.xsd'>
     <metadata>
          <title>entityGetPublicIdNull</title>
          <creator>NIST</creator>
          <description> The "getPublicId()" method of an Entity node contains the public identifier associated with the entity, if one was not specified a null value should be returned. Retrieve the entity named "ent1" and access its public identifier. Since a public identifier was not specified for this entity, the "getPublicId()" method should return null. </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-D7303025'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='docType' type='DocumentType'/>
     <var name='entityList' type='NamedNodeMap'/>
     <var name='entityNode' type='Entity'/>
     <var name='publicId' type='DOMString'/>
     <load var='doc' href='staff' willBeModified='false'/>
     <doctype obj='doc' var='docType'/>
     <assertNotNull actual='docType' id='docTypeNotNull'/>
     <entities obj='docType' var='entityList'/>
     <assertNotNull actual='entityList' id='entitiesNotNull'/>
     <getNamedItem obj='entityList' var='entityNode' name='"ent1"'/>
     <publicId interface='Entity' obj='entityNode' var='publicId'/>
     <assertNull actual='publicId' id='entityGetPublicIdNullAssert'/>
</test>

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