[Tracker] Notification and ontology questions

Hi folks,

A few notification and custom ontology questions

Notification questions:
- Does libtracker-client support receiving org.freedesktop.Tracker1.Resources.Class signals? It doesn't appear to -- is there a plan for this in the future? (Does anyone have any sample glib-dbus signal listening code?)
- What's the mechanism to add classes for which notifications are sent? Let's say I want to be notified of all FileDataObject changes -- how do I do that?
- It *appears* that tracker-store is sending duplicate signals for Subjects[Added|Changed|Removed]. I'm on 0.7.23. Is this known? Or it could be my wonky dbus signal listening code. :)

- I need to define custom ontology that describes books, periodicals, etc. While some of the data is fairly generic, other is sufficiently specific to our projects that it wouldn't make sense to push it outside of our use. What's the best way to do that? Do I add my own file, something like <tracker>/data/ontologies/95_book.ontology?
- Is there a way to define or extend ontology at runtime? 


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