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// in XPath

//elem-name finds all elements named elem-name.
The XML file: 
<a>one
  <b>two
    <c>three
       <d>four
         <e>five
         </e>
       </d>
    </c>
  </b>
  <e>six
  </e>
</a>
The XPath expression //e finds two elements named e: the one with six and the one with five.