[Zope] ZopeGUD

The Workspace.zexp thing with zopegud-1.0.0-preview5.tar.gz didn't work because there already is an Catalog with the id Catalog apparently (not as far as I can see though). Then it says (http://www.zope.org/Members/morphex/ZopeGUD) that if the .zexp doesn't work, one should create your own in the Zope management interface. How to do that? What do I need? What am I supposed to throw into the mix? Peter