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

<test name='documenttypegetentitieslength' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-1 dom1.xsd'>
     <metadata>
          <title>documenttypeGetEntitiesLength</title>
          <creator>NIST</creator>
          <description> Duplicate entities are to be discarded. Retrieve the Document Type for this document and create a NamedNodeMap of all its entities. The entity named "ent1" is defined twice and therefore that last occurrance should be discarded. </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-1788794630'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='docType' type='DocumentType'/>
     <var name='entityList' type='NamedNodeMap'/>
     <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'/>
     <if>
          <contentType type='image/svg+xml'/>
          <assertSize collection='entityList' size='7' id='entitySizeSVG'/>
          <else>
               <assertSize collection='entityList' size='5' id='entitySize'/>
          </else>
     </if>
</test>

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