Merging set of elements based on a common attribute in XSLT 1.0

Question

I m working with XSLT1.0 . My requirement is to merge set of elements based on a common attribute. I ve an xml which looks like this:

Answer 1

As shown in the other topic halfbit linked to, you need to use a key in order to (1) select distinct products (aka the Muenchian method) and (2) collect the values from the related group.

Here's a little more readable (IMHO) version:

    
    
    
        
        
            
            
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If your processor is EXSLT capable, you can use the set:distinct() function instead of the Muenchian grouping.