Describing module interfaces

[Steinar Bang <sb@dod.no>]

I need to describe and enumerate, and classify all interfaces of some
software modules in a big software system.  Is there any good markup
for that?  <interface> isn't it.  Neither is <interfacename> (the
object oriented stuff could _possibly_ be used when detailing some
parts of some interfaces that are APIs in object oriented languages.
But it's no good for the high level approach).

So far I've just used <section>.