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//@id
选择所有的id属性

     <AAA>
          <BBB id = "b1"/>
          <BBB id = "b2"/>
          <BBB name = "bbb"/>
          <BBB/>
     </AAA>
在XLab中打开实例 | 树视图 (JPG)
 
//BBB[@id]
选择有id属性的BBB元素

     <AAA>
          <BBB id = "b1"/>
          <BBB id = "b2"/>
          <BBB name = "bbb"/>
          <BBB/>
     </AAA>
在XLab中打开实例 | 树视图 (JPG)
 
//BBB[@name]
选择有name属性的BBB元素

     <AAA>
          <BBB id = "b1"/>
          <BBB id = "b2"/>
          <BBB name = "bbb"/>
          <BBB/>
     </AAA>
在XLab中打开实例 | 树视图 (JPG)
 
//BBB[@*]
选择有任意属性的BBB元素

     <AAA>
          <BBB id = "b1"/>
          <BBB id = "b2"/>
          <BBB name = "bbb"/>
          <BBB/>
     </AAA>
在XLab中打开实例 | 树视图 (JPG)
 
//BBB[not(@*)]
选择没有属性的BBB元素

     <AAA>
          <BBB id = "b1"/>
          <BBB id = "b2"/>
          <BBB name = "bbb"/>
          <BBB/>
     </AAA>
在XLab中打开实例 | 树视图 (JPG)



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