[erlang-questions] how: info on how to traverse abstract format trees?

[Tim Fletcher]

The ERTS User's Guide describes the abstract format, but is there any
info (official or otherwise) on how best to traverse these trees? It's
possible to get most of the way by just matching on the terms and
guessing which parts to traverse next, but it would be easier if there
was a clearer definition of what should be handled.