Web Objects in XML (serializer) provides easy XML serialization of Java and C# objects. Objects are serialized to a file in a standard XML format. They can then be de-serialized either to Java or C#.
Web Objects in XML (Framework) is an interoperable and lightweight system for distributed objects. It is currently built in Java and C#. Remote objects are serialized in a standard XML format, and they are accessible trough their own URL.