When wsdl4j 1.6.1 digests the attached wsdl, it comes up with a null type name (and element name) for the mimeAttachment part, which is declared to be of type xsd:base64Binary.
Example of problem
Logged In: YES
One small correction. The part comes through with a null type name and a stupid element name (the name of the part itself) which is not in the schema.