    # File lib/graphviz/edge.rb, line 100
        def []( xAttrName )
          # Modification by axgle (http://github.com/axgle)
          if Hash === xAttrName
            xAttrName.each do |key, value|
              self[key] = value
            end
          else
            if @oAttrEdge[xAttrName.to_s]
              @oAttrEdge[xAttrName.to_s].clone
            else
              nil
            end
          end
        end