# File lib/rgen/util/model_comparator_base.rb, line 53
        def sortElementPairs(pairs)
                pairs.sort do |x,y|
                        a, b = x[0], y[0]
                        r = a.class.name <=> b.class.name
                        r = compareSpec(a).sort.call(a,b) if r == 0 && compareSpec(a) && compareSpec(a).sort
                        r
                end
        end