The Interface Definition Language (IDL) is a crucial language to learn and attain, as all CORBA services are described by it. It is not, however, a complex language to learn. If you've managed to acquire a reasonably difficult language like Java, then picking up IDL will be a breeze.
The IDL defines many language constructs, allowing a rich schema of objects to be described. We'll cover each of the basic ones, but readers are advised to read the “Java Language Mapping to OMG IDL Specification,” published by the Object Management Group.
The IDL documentation is available ...