[Zope3-Users] Simple Sources tutorial?

[Alec Munro]

Anyone have a simple reference on the usage of sources? I'm in need of
a vocabulary-like thing, and my understanding is that vocabularies
have been replaced by sources, but I am unable to find any
documentation on their use. There are numerous discussions on specific
details of sources, but I haven't found any real tutorials that cover
how you register them, how you reference them, and real-world examples
of their use.

Thanks,

Alec