[Zope-dev] more on sessions in general.

It seems to me that the Session type object as used in SQLSession is a useful general class of object (regardless of the backend storage). Is it worth making this a more general piece of Zope? Right now, you have to do a <dtml-call Session> at the start of the transaction to get the REQUEST.SESSION object created - it would be nice if this was done automagically (and done in a way that allowed you to slot in a different Session object if you wanted it...) Any thoughts? Anthony