Hi, I'm currently building a 'URLstore', a product which will classify articles by their URLS. I am having a slight problem with Zclassses. I have created an objectAware Zclass named 'Category' and have created another Zclass within it named 'IntroArticle'. I need the product to be able to create Category instances (so far no problem) and then within the category create an Introarticle instance (again simple stuff) but also give an option to create another Category Instance WITHIN the first category instance. Something like this if that wasn't clear: Category 1: IntroArt 1 IntroArt 2 Category A: IntroArt1 IntroArt2 Category a: etc. Category B Category C Category 2: <same as above> <etc.> I am a beginner at OOP so perhaps the above situation is very simple, but so far I have racked my brains against my keyboard enough to cause a minor headache (and my poor keyboard isn't looking so hot either anymore) Any help or suggestions would be greatly appreciated. TIA, Tom