# File lib/dbus/introspect.rb, line 209
    def to_xml
      xml = %{<signal name="#{@name}">\n}
      @params.each do |param|
        name = param.name ? %{name="#{param.name}" } : ""
        xml += %{<arg #{name}type="#{param.type}"/>\n}
      end
      xml += %{</signal>\n}
      xml
    end