I found a bug in semantic queries in 1.0 (it might be the case in earlier versions as well) - page names are compared case insensitively which leads to wrong results.
I've created a bug http://bugzilla.wikimedia.org/show_bug.cgi?id=11689 that describes this in more detail. Notice that $wgCapitalLinks setting should be honored as well.


Sergey Chernyshev