The doxygen docs should be in the xqilla-devel repo. (XQilla has doxygen docs, but we don't seem to ship them in our rpms.)
Since the amount of xqilla documentation is rather large, I created a separate package for it (xqilla-doc): * xqilla-2.0.0-1.1.fc8 * http://koji.fedoraproject.org/koji/taskinfo?taskID=478607