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实例 22 > 样例 1

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实例
 
//BBB[position() mod 2 = 0 ]
选择偶数位置的BBB元素

     <AAA>
          <BBB/>
          <BBB/>
          <BBB/>
          <BBB/>
          <BBB/>
          <BBB/>
          <BBB/>
          <BBB/>
          <CCC/>
          <CCC/>
          <CCC/>
     </AAA>
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