[Zope] Question arisinfg from Beehive ZClass Tut

Hello. This is a question for someone familiar with the Beehive ZClass tutorial. Everything is quite reasonable. However, in the add_instance_html DTML Method, there is a dtml-call to Bookclass_add(_.None, _, NoRedir=1). I understand that "_" is the default namespace, but I don't get the "_.None" parameter. Any help woulf be much appreciated. _______________________________________________________ Do You Yahoo!? Get your free @yahoo.ca address at http://mail.yahoo.ca