# File lib/openid/consumer/discovery.rb, line 85
    def preferred_namespace
      if (@type_uris.member?(OPENID_IDP_2_0_TYPE) or
          @type_uris.member?(OPENID_2_0_TYPE))
        return OPENID_2_0_MESSAGE_NS
      else
        return OPENID_1_0_MESSAGE_NS
      end
    end