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Function name() returns name of the element, the starts-with function returns true if the first argument string starts with the second argument string, and the contains function returns true if the first argument string contains the second argument string.
 
//*[name()='BBB']
Select all elements with name BBB, equivalent with //BBB

     <AAA>
          <BCC>
               <BBB/>
               <BBB/>
               <BBB/>
          </BCC>
          <DDB>
               <BBB/>
               <BBB/>
          </DDB>
          <BEC>
               <CCC/>
               <DBD/>
          </BEC>
     </AAA>
Open the example in XLab. | Tree view (JPG)
 
//*[starts-with(name(),'B')]
Select all elements name of which starts with letter B

     <AAA>
          <BCC>
               <BBB/>
               <BBB/>
               <BBB/>
          </BCC>
          <DDB>
               <BBB/>
               <BBB/>
          </DDB>
          <BEC>
               <CCC/>
               <DBD/>
          </BEC>
     </AAA>
Open the example in XLab. | Tree view (JPG)
 
//*[contains(name(),'C')]
Select all elements name of which contain letter C

     <AAA>
          <BCC>
               <BBB/>
               <BBB/>
               <BBB/>
          </BCC>
          <DDB>
               <BBB/>
               <BBB/>
          </DDB>
          <BEC>
               <CCC/>
               <DBD/>
          </BEC>
     </AAA>
Open the example in XLab. | Tree view (JPG)