[Zope] Making importable files

I'd like to write a program that outputs XML files similar to the ones Zope exports. Problem is, there are id attributes in its tags that seem to be of a random, indexie nature. If I write a program that outputs XML like Zope's, how do I handle those id tags? Can someone point me in the right direction of making Zope-compatible importable XML files? Also, does anyone know if something like a "link" class is out there?