Hello! I created and published three demo toy Products I named them "Random" Products, because each of them displays text, randomly selected from a list prepared by webmaster. These Products differ in how they store the text items. I learned a good deal of Zope internals while wrote it, and I hope that looking into it will help people to learn Product API. I also run a demo site for these Products. Source code: http://www.zope.org/Members/phd/Random/ Demo site : http://sun.med.ru/pcgi/Random/ DETAILS: The first Product, RandomLine was created from Boring Product - I just learned Product API. The product stores text (edited in a texarea), splits the text into a list of lines and when asked displays a random line. The second Product, RandomLine_v, is just a modified version of the first. The difference is volatile attributes. I found (in RandomLine) that I store both text and splitted list of strings in ZODB. I thought I need to learn volatile attributes and this version stores only text in ZODB. The splitted list stored in a volatile attribute and recomputed when neccessary. The third Product, RandomItem, implements the same idea, but with different implementation. The core class is ObjectManager-derived, and it stores a list of items. Every item in turn stores multiline text. Oleg. ---- Oleg Broytmann http://www.zope.org/Members/phd/ phd2@mail.com Programmers don't die, they just GOSUB without RETURN.