sequences in XSLT

Question

my xml input is-

 
  bar 
       bar 
       

        

Answer 1

Same as here, use the id of the first preceding sibling whose name is different in order to group the records:

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Added:

But the output i am getting is not same as my desired output...

When applied to your (cleaned up) input of:

 

    bar 
    bar 
    foobar 
    foobar 
    foobar
    bar
    bar 

the result is:

  
    
      bar
      bar
    
    
      foobar
      foobar
      foobar
    
    
      bar
      bar
    
  

which to me seems to be exactly the result you have asked for:

   
  
  
 bar  
 bar
 
  
 foobar>
 foobar>
 foobar>
  
       
 bar  
 bar 
 
 

except for the > characters inside the elements, which I have removed from the input.

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P.S. Please DO NOT delete your question after it has been answered.