What version of Fuse ESB are you using? And did it work before etc?
If you have a FuseSource subscription I suggest to use that channel to ask for help.
I use the FuseESB apache-servicemix-4.4.1-fuse-02-05 and have no FuseSource subscriptions.
I did not use xsd imports in previous versions of FuseESB, so I can not give you any reports to the behaviour in prevous versions.
I cannot use the newest apache-servicemix-4.4.1-fuse-03-06 because of Java crash with this newest version on 64 bit AMD machine.
(To this Java error you can see my post on http://servicemix.396122.n5.nabble.com/ServiceMix-4-4-1-fuse-03-06-Java-machine-crashing-on-64-bit-server-during-startup-tp5669931.html)