[Zope] xml-rpc and binary data & ZServer/medusa/rpc_server.py

Hi! Can somone tell me what kind of rpc ZServer/medusa/rpc_server.py provides? I am searching an alternative to xml-rpc becaues xml-rpc does only allow base64 encoded binary data. Is there a way to handle encoding and decoding of binary data transparently? (Without writing a wrapper or changing the source of zope) thomas