http://telepathy.freedesktop.org/xmpp/clique is the XML namespace for
Clique, a protocol for link-local XMPP chat rooms over reliable multicast.

http://telepathy.freedesktop.org/xmpp/clique.html contains some protocol
documentation. The source code for this document is docs/clique.xml
in Salut.

This URL is also the reference for the 'clique' entry in
http://www.dns-sd.org/ServiceTypes.html. For the purposes of that registration,
the only defined TXT record key is "txtvers" which currently has value "0";
implementations SHOULD NOT resolve the TXT record, unless they implement a
future version of Clique that defines some more keys for it.