For a general introduction to XOS and how it is used in CORD, see http://guide.xosproject.org. The "Developer Guide" at that URL is especially helpful, although it isn't perfectly sync'ed with master. Additional design notes, presentations, and other collateral are also available at http://xosproject.org and http://opencord.org.
The best way to get started is to look at the collection of canned configurations in xos/configurations/
. The cord
configuration in that directory corresponds to our current CORD development environment, and the README.md
you'll find there will help you get started.
Source tree layout: