如何解析和使用XPATH

Question

使用下面的XML

<node1> 
<node2> 
    <node3> 
     <id>ABC-123</id> 
     <condition> 
      <task name="task1" operation="and" value="abc" /> 
      <task name="task2" operation="and" value="efg" /> 
      <task name="task3" operation="and" value="hij" /> 
      <task name="task4" operation="or" value="klm" /> 
      <task name="task5" operation="and" value="nop" /> 
      <task name="task6" value="uvw" /> 
     </condition> 
    </node3> 
    <node3> 
     <id>XYZ-987</id> 
     <condition> 
      <task name="task1" operation="and" value="abc" /> 
      <task name="task2" operation="and" value="efg" /> 
      <task name="task5" operation="and" value="nop" /> 
     </condition> 
    </node3> 
    <node3> 
     <id>RST-567</id> 
     <condition> 
      <task name="task1" operation="and" value="abc" /> 
      <task name="task2" operation="and" value="efg" /> 
      <task name="task8" operation="and" value="jkl" /> 
      <task name="task9" operation="and" value="rst" /> 
      <task name="task10" value="xyz" /> 
     </condition> 
    </node3> 
    <node3> 
     <id>PQR-345</id> 
     <condition> 
      <task name="task1" operation="and" value="ijk" /> 
      <task name="task2" operation="and" value="klm" /> 
      <task name="task8" operation="and" value="jkl" /> 
      <task name="task9" operation="and" value="rst" /> 
     </condition> 
    </node3> 
</node2> 
</node1> 

我想ID = XYZ-987的条件名称=“任务1”，值=“ABC”名称从XML获取确切的结果= “task2”，value =“efg”AND name =“task5”，value =“nop”

我得到2个结果（ABC-123和XYZ-987）而不是1个（XYZ-987）。 使用下面的XPath表达式

/node1/node2/node3[condition/task[@name='task1' and @value='abc'] and condition/task[@name='task2' and @value='efg'] and condition/task[@name='task5' and @value='nop']]/id 

我怎么能过滤这些结果2基于输入条件的大小和如上所述获得与恰好3个条件的条目？

参考XPATH executing complex queries来开发表达。

Answer 1

通过在表达式中追加“和count（条件/任务）= 3”得到答案。

/node1/node2/node3[condition/task[@name='task1' and @value='abc'] and condition/task[@name='task2' and @value='efg'] and condition/task[@name='task5' and @value='nop'] and count(condition/task)=3]/id