Presence_XCAPDiff is an OpenSIPS module that adds support
for "xcap-diff" event to presence and pua.
At the moment, the module just registers the event but
doesn't do any event-specific processing.
Registering event with pua allows XCAP server to publish
xcap-event when modification of a document happens.
Registering event with presence allow clients to
subscribe for the event.
The module is intended to be used with OpenXCAP
(www.openxcap.org) server, although it doesn't contain
any OpenXCAP-specific code and potentially could
be used with any XCAP server.
I'll maintain this module.