[[!meta copyright="Copyright © 2007, 2008 Free Software Foundation, Inc."]] [[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable id="license" text="Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled [[GNU Free Documentation License|/fdl]]."]]"""]] An IDL is an interface definition language. The most well-known is CORBA. An IDL compiler takes a specification and generates stubs that hide the transport details. In the case of [[microkernel/mach/MIG]], this hides the marshalling and unmarshalling of parameters according to [[microkernel/Mach]]'s semantics.