About return type and parameter type in IDL

I don't know how to define return type and parameter type in
operations in a module which are not listed in predefined in
IDL. can I define these types as java class?
can someone help me where a tutorial about this in detail can
be found?
thanks a lot

My understanding is that if something is not in the IDL definition, then as far as the CORBA system is concerned it doesn't exist.
Therefore any methods you create in a class that implements an IDL defined interface, that are outside that interface, are completely free and outside the CORBA system.
The parameters and return types of these 'local native' methods should be java classes. All methods and variables outside the IDL spec will only be visible to the local JVM.
ciao
Jim
PS - there is a zip file containing a very long and fairly messy demo of this behaviour at http://clio.mit.csu.edu.au/subjects/itc327/Asg2Demo.zip
it has an html file which describes using additional non-IDL 'local native' methods for implementing a save/load function

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