Hey,
We talked about using Atom as a feed for search query updates
I experimented with using it as a container for even 'GET /vms':
http://git.fedoraproject.org/git/?p=rhevm-api.git;a=commitdiff;h=3fff835a
See rest-practices:
https://www.redhat.com/archives/rest-practices/2010-April/msg00018.html
Cheers,
Mark.