After the many discussions the Tracker team did at the Desktop Summit in Gran Canaria I think a lot of people will start trying out Tracker’s master. We will indeed start making 0.7.x releases somewhere this or next month.
Meanwhile I’d like to point out that among the decisions that we made during the meetings and at the Ontology BOFs is that we wont use the URL of resources as the RDF’s subject field anymore. Instead we’ll use the nie:isStoredAs predicate for storing the URL.
Right now we already set nie:isStoredAs, but we still use the URL as subject. This will change, though. Just assume the subject to be something you should only use as an unique piece of data about the resource, pointing at it (in the RDF store). More details can be found here. If you want the thing itself (the file, the E-mail, the .desktop file, the website’s URL), ask for nie:isStoredAs.
For example:
<file:///tmp/myfile.png> a nfo:FileDataObject . <urn:nepomuk:file:d7ea...> a nfo:Image ; nie:isStoredAs <file:///tmp/myfile.png> .
And to query:
tracker-sparql -q "SELECT ?url WHERE { ?subject a nfo:Image ; nie:isStoredAs ?url }
We know that many people want these 0.7.x releases to happen soon. I can only invite those people to just join coding. Awesome stuff is indeed taking place, but at the same time there is a lot of work and decision making to do.
Things like a user interface like the T-S-T (Tracker Search Tool) from Tracker 0.6, documentation with a lot of examples. SPARQL, SPARQL Update and Nepomuk all have quite a lot of documentation by themselves. But people are still asking for even more examples. Anybody interested in making that? Maybe if somebody who was at Rob Taylor’s BOF could write down his and Jürg’s lectures on RDF and SPARQL? I think they explained it all very well.