I have what seems like a Protege bug in the SPARQL plug-in.
When I execute the query in the Protege environment I get a
"no matches found" message box. When I execute this same query
via Jena's script I get the expected result. What is interesting
is that this happens when the selection criteria involves an
instance. Selection using classes as a criteria execute correctly.
I include the owl file in case anyone needs it for testing.
Please note that I tested this with Jena 2.3 (12/10/2005) because that
is listed in the download area, even though a 2.4 seems to be available
since the 4/5/2006 (site not updated?). I don't think this is a Jena issue.