Understanding how comments are parsed in clang

Hello,

On the 3.5.0 some facilities are available in libclang to extract the
comments attached to declarations.

One thing i do not fully grasp is how some commands in the comments get parsed.

Is there (apart from the source code and the clang doxygen
documentation) a source for what doxygen commands are supported and
how they map?

More specifically i'm looking for things like ref, copydoc, copybrief.

Thank you