[Zope] uses for lines, token properties?

The documentation seems sparse to nonexistent on the subject of the lines and tokens property types. And I've seen reference to a tuple property type, but it's not an option using the UI. Could someone enlighten me as to the uses of these properties? I know I can iterate thru lines, and if I knew more about parsing strings in the Zope environment I could probably use them as I would like (generating links to anchors in a document body [that I'll hard code anchors into]).(He said, sneakily embedding yet another question...) Hints, pointers to documentation or code or examples? Thanks.