[Zope] deleting objects in a folder from a script

Hi, in order to upgrade existing instances of a Product (which changed - see previous mails), I now use the following approach in the repair() function of my product: 1) delete all dtml-pages in the instance 2) add all dtml-pages from the product to the instance I use this approach because I have already the function which does 2). Now I browsed through the ObjectManager API, but I cannot find a way to delete a certain child-object. How can I do that? sorry if this is a dumb question (; Andreas