[Zope] I don't understand a specific <dtml-var> behavior

I'm still trying to learn DTML and in particular the various rules for when to quote or not or... I have come across the following syntactic issue which I don't understand. <dtml-var title> puts the title in the document. Fine. <dtml-var "title"> puts the title in the document. Fine. <dtml-var id> puts the id in the document. Fine. <dtml-var "id"> puts Nothing in the document. ????. Danny __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com