[Tracker] Boolean searches

[Mark Florian <markrian gmail com>]

I've searched through the mailing list archives, the website and man
pages for tracker and haven't found an answer to this question: is it
possible to perform Boolean searches with any of tracker's search tools?
For instance, I might want to search for all documents with the word
"chip" which also contain "fish":

chip AND fish

or, in a web search engine fashion,

+chip +fish

Or perhaps I want chip but not fish:

chip NOT fish

or

+chip -fish

Is this possible (yet)?

Thanks!