class OpenID::Extension

# File lib/openid/extension.rb, line 7
def initialize
  @ns_uri = nil
  @ns_alias = nil
end

# File lib/openid/extension.rb, line 14
def get_extension_args
  raise NotImplementedError
end

# File lib/openid/extension.rb, line 21
    def to_message(message = nil)
      if message.nil?
#         warnings.warn('Passing None to Extension.toMessage is deprecated. '
#                       'Creating a message assuming you want OpenID 2.',
#                       DeprecationWarning, stacklevel=2)
        Message.new(OPENID2_NS)
      end
      message = Message.new if message.nil?

      implicit = message.is_openid1()

      message.namespaces.add_alias(@ns_uri, @ns_alias, implicit)
      # XXX python ignores keyerror if m.ns.getAlias(uri) == alias

      message.update_args(@ns_uri, get_extension_args)
      return message
    end