How do I prevent duplicates, in XSL?

Question

How do I prevent duplicate entries into a list, and then ideally, sort that list? What I\'m doing, is when information at one level is missing, taking the information from

Answer 1

try using a Key group in xslt, here's an article on the Muenchian method which should help to eliminate duplicates. http://www.jenitennison.com/xslt/grouping/muenchian.html