>> I have heard discussions about using line or even separator, but then in some you can't add objects that are not "alike".
I use session or relation for prg based classes. <<

I understand the appeal of using lightweight classes but something about designating custom classes as Line or Relation has always rubbed me the wrong way. It isn't a line. It isn't a relation. This is exactly what Custom classes were designed for, sort of "none of the above."

Mike