[Zope] a simple question about find

Hello all-- I've successfully added a catalog to search for my attributes in my custom ZClass. Zope finds and displays my objects correctly. However, the URL to access the object is broken. The object IDs are not URL-encoded correctly and the spaces in some of my object IDs cause problems. Are spaces disallowed as object IDs (so far, Zope has only complained when I tried to add an object with a forward slash in the name)? Or (more likely IMO), is this a configuration option that I've missed? Thanks in advance. --Brad