[Zope] ZClass with binary fields

Hi! I want to have special folders and documents to which i can attach binary data, e.g. pdfs, wavs etc.. how can i create a ZClass with a field for binary data? the second problem ois more difficult: the zclass has to be capable of carrying an unlimited number of attachments. so either add_property for a new attachment has to be possible, or the data has to be stored in an array. any ideas how this could be done? thanks in advance! Klaus -- Klaus Herrmann <klaus.herrmann@goelz.com> Goelz & Schwarz GmbH, Munich www.goelz.com phone:+49 - (0)89 - 544 67 0 22 fax: +49 - (0)89 - 544 67 0 10