How to remove duplicate XML nodes using XSLT

Question

I\'ve got an extremely long XML file, like

   
      context1
      test1
         


        

Answer 1

If the OP's provided XML is representative of his/her question (and the 2nd inside each element should be removed), then Muenchian Grouping isn't necessary:

XSLT:

When run against the provided XML:

  
    context1
    test1
    context1
  
  
    context2
    test2
    context2
  

...the desired result is produced:

  
    context1
    test1
  
  
    context2
    test2