Comment 1 for bug 353644

The lines should match the following syntax:

deb|deb-src uri distribution [component1] [component2] [...]

http://www.debian.org/doc/manuals/repository-howto/repository-howto#using-a-repository

There are modules for checking URIs, they could be used.

The distribution can be a list or hash of strings (jaunty, hardy, hardy-backports, etc.)