XSLT2.0删除节点中的重复值(XSLT2.0 Remove duplicate values in node)

 我一直在试图弄清楚如何使用XSLT从XML文档中删除具有重复值的元素。 
 
 例如：输入： 
 
<main>
   <h1>
      <node1>duplicate</node1>
      <node1>duplicate</node1>
      <node1>New data</node1>
      <node1>New data 2</node1>
      <node1>duplicate</node1>
   </h1>
</main>
 
 预期产出： 
 
<main>
   <h1>
      <node1>duplicate</node1>
      <node1>New data</node1>
      <node1>New data 2</node1>
   </h1>
</main>
 
 我相信这一定不会太复杂，但我无法理解迄今为止见过的任何方法。 谢谢！ 
 
 感谢下面的Michael！ 例如，如果上面的例子有更多的节点（永远不会重复），我还有一个问题 
 
 <main>
   <h1>
      <node1>duplicate</node1>
      <node1>duplicate</node1>
      <node1>New data</node1>
      <node1>New data 2</node1>
      <node1>duplicate</node1>
      <node2> Data </node2>

   </h1>
</main>
 
 我将如何通过XSLT代码提供这些数据？ 以下解决方案删除了​​我发现的任何其他数据，尽管我理解了要复制所有的身份转换，以及仅修改匹配模板的匹配。 

I have been trying to figure out how to remove elements with duplicate values from an XML document using XSLT.
 
For example: Input:
 
<main>
   <h1>
      <node1>duplicate</node1>
      <node1>duplicate</node1>
      <node1>New data</node1>
      <node1>New data 2</node1>
      <node1>duplicate</node1>
   </h1>
</main>
 
expected output:
 
<main>
   <h1>
      <node1>duplicate</node1>
      <node1>New data</node1>
      <node1>New data 2</node1>
   </h1>
</main>
 
I'm sure this must not be too complicated but I am failing to understand any methods I have seen so far. Thanks!
 
Thanks to Michael below! I have a further question, if the above example had more nodes (which would never be duplicate), for example 
 
 <main>
   <h1>
      <node1>duplicate</node1>
      <node1>duplicate</node1>
      <node1>New data</node1>
      <node1>New data 2</node1>
      <node1>duplicate</node1>
      <node2> Data </node2>

   </h1>
</main>
 
How would I bring this data through in the XSLT code? The below solution removes any additional data I have found despite my understanding of the identity transform to copy all, and the match to modify only matching templates.

原文：https://stackoverflow.com/questions/34901852