[Zope] ZPT newbie:dtml-if last-XXX equivalent?

Hello, I'm fairly comfortable with DTML - just trying to look into the ZPT way. We use SQL methods extensively and most of our methods are heavily joined for performance reasons. In DTML it is very easy to find group break points by using sequence variabled first-XXX or last-XXX. Are there any equivalents of these in ZPT? I really don't want to use a asp/php/perl kind of solution where we code to keep the previous value in memory and then compare with the current value :-) Thanks in advance vsb