# File lib/rgen/util/model_comparator_base.rb, line 129
        def compareSpec(element)
                @compareSpec ||= {}
                return @compareSpec[element.class] if @compareSpec[element.class]
                return nil unless self.class.compareSpecs
                key = self.class.compareSpecs.keys.find{|k| element.is_a?(k)}
                @compareSpec[element.class] = self.class.compareSpecs[key]
        end