expand_service (OpenID::Yadis)

    # File lib/openid/yadis/xrds.rb, line 138
        def Yadis::expand_service(service_element)
          es = service_element.elements
          uris = es.each('URI') { |u| }
          uris = prio_sort(uris)
          types = es.each('Type/text()')
          # REXML::Text objects are not strings.
          types = types.collect { |t| t.to_s }
          uris.collect { |uri| [types, uri.text, service_element] }
        end