# File lib/openid/yadis/xrds.rb, line 124
    def Yadis::is_xrds?(xrds_tree)
      xrds_root = xrds_tree.root
      return (!xrds_root.nil? and
        xrds_root.name == ROOT_TAG.name and
        xrds_root.namespace == ROOT_TAG.namespace)
    end