When you say you're writing the client API for a Python object database, do you mean a database that will only hold Python objects, or one that may contain arbi

When you say you're writing the client API for a Python object database, do you mean a database that will only hold Python objects, or one that may contain arbitrary data structures, and be accessible from other languages as well? XMPP may be a more efficient protocol than HTTP for stateful, session-oriented communication, but using it as a database client protocol is going to introduce a lot of overhead as compared to, say, using Protocol Buffers, or even the native ZEO Client interface. Is there something about the ZODB/ZEO combination that doesn't work for your application?