** Changed in: zeitgeist
    Milestone: 0.4.1 => 0.5.0

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Hard to use exclusive queries
https://bugs.launchpad.net/bugs/592599
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Status in Unity Files Place: Fix Released
Status in Zeitgeist Framework: Fix Released

Bug description:
(Canonical hat on)

For Unity we want to try and group recent files into some categories like 
Documents, Images, Video, Presentations, etc, and I've discovered an 
unfortunate decision in our template matching algorithm, making this quite hard 
to get 100% right.

The deal is that the designers think that the Documents section should not 
contain Presentations (which makes quite good sense if there is a separate 
section for this). Also we'd like to have an "Other" section with unclassified 
stuff. But since nfo:Presentation is a subclass of nfo:Document a query for all 
documents would also include all presentations (which is "correct", but not 
what we want in this particular case).

So roughly speaking the query for the Documents section should be

  all subtypes of nfo:Document but NOT nfo:Presentation

Currently this is simply not possible in Zeitgeist, because we do logical OR 
between all subject templates. What I'd propose to do to make these kind of 
queries possible, is to switch to logical AND between subjects, but keep it at 
logical OR between events. So in code I'd like the following code to work:

  su1 = Subject.new_for_values(interpretation=DOCUMENT)
  su2 = Subject.new_for_values(interpretation="!"+PRESENTATION)
  ev = Event()
  ev.subjects.append(su1)
  ev.subjects.append(su2)
  # now query for [ev].

As you probably realize we have the same problem (but even stronger) in the 
"Other" section where we want to exclude all the listed sections and match 
everything else.



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