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Function count() counts the number of selected elements
 
//*[count(BBB)=2]
Select elements which have two children BBB

     <AAA>
          <CCC>
               <BBB/>
               <BBB/>
               <BBB/>
          </CCC>
          <DDD>
               <BBB/>
               <BBB/>
          </DDD>
          <EEE>
               <CCC/>
               <DDD/>
          </EEE>
     </AAA>
Open the example in XLab. | Tree view (JPG)
 
//*[count(*)=2]
Select elements which have 2 children

     <AAA>
          <CCC>
               <BBB/>
               <BBB/>
               <BBB/>
          </CCC>
          <DDD>
               <BBB/>
               <BBB/>
          </DDD>
          <EEE>
               <CCC/>
               <DDD/>
          </EEE>
     </AAA>
Open the example in XLab. | Tree view (JPG)
 
//*[count(*)=3]
Select elements which have 3 children

     <AAA>
          <CCC>
               <BBB/>
               <BBB/>
               <BBB/>
          </CCC>
          <DDD>
               <BBB/>
               <BBB/>
          </DDD>
          <EEE>
               <CCC/>
               <DDD/>
          </EEE>
     </AAA>
Open the example in XLab. | Tree view (JPG)