[Tracker] Documentation for tracker-query?

[Jens Lechtenboerger <lechten helios uni-muenster de>]

Hi there,

I'm looking for documentation on tracker-query.

The "example queries in the RDF-Query-examples folder" promised in
the README.gz of /usr/share/doc/tracker-utils/ on Ubuntu 8.04 are
missing.  Nevertheless, I found some at:
http://svn.gnome.org/viewvc/tracker/trunk/rdf-query-examples/

Then I found a spec for meta-data attributes at:
http://freedesktop.org/wiki/Specifications/shared-filemetadata-spec?action=show&redirect=Standards%2Fshared-filemetadata-spec

However, one of the sample queries uses File:Mime, which is not
listed in the spec.  What is available?

Then, the tracker-search-tool sorts results into "categories".  How
would I find, say, all Music files with tracker-query?

Thanks in advance
Jens