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Answers and rating deltas for

How can I sum-up the values by each category in xsl?

Author Votes Δ
Lukasz 1 +0.37
Dimitre Novatchev 1 -0.08
fire.eagle 1 +1.41
Vitaliy 0 -3.70
Last visited: Sep 14, 2014, 5:07:29 AM