Re: Proposing Tracker for inclusion into GNOME 2.18

["Jos van den Oever" <jvdoever gmail com>]

2006/10/25, Ross Burton <ross burtonini com>:
> On Wed, 2006-10-25 at 11:41 +0100, Jamie McCracken wrote:
> > > I'm thinking of decent genre support, so multiple genre tags per song
> > > (as supported in Ogg).  If a song has Song.Genre="Post Rock,Ambient" and
> > > I search for "rock", will the substring search incorrectly match the
> > > song?
> >
> > Yes it will unfortunately - hopefully these corner cases wont be too common
>
> I had a look at Beagle to see what it does.  It allows the index to
> store multiple data items for each keyword.  For example from the email
> filter:
>
> using (GMime.InternetAddressList addrs = this.message.GetRecipients (GMime.RecipientType.To)) {
>         foreach (GMime.InternetAddress ia in addrs)
>                 AddProperty (Property.NewKeyword ("fixme:to", ia.ToString ());
>         }
> }

What we need is a way to specify the types of metadata fields. This
would allow us to generate optimal storage from that definition and
would also help building queries and sorting of results. E.g. a
property 'widthInPixels' would have the type 'xs:int' (I think using
the subset of XML Schema that can be mapped to DBus would a sensible
choice of allowed types).
The spec would assign such a type to URIs that specify the metatype field name.

> Note how each person listed in the To: field of the email is added to
> the index as a separate entry, so that searches like "receipient ends
> with foo.com" would work correctly.  The same feature would allow
> multiple artists per song and so on.
>
> I do wonder why nobody has taken a fast database-backed RDF triple store
> (from librdf), put a sparql-based frontend on it for queries (again from
> librdf) and used re-used a lot of code from both Beagle and Tracker for
> harvesting the metadata...

Currently there's a flurry of development going on on just that. It's
lead by Sebastian Trues, who's sponsored by Mandrake.

Check it out:
http://websvn.kde.org/trunk/playground/base/qrdf/
http://websvn.kde.org/branches/work/nepomuk-kde/

> Ross
> --
> Ross Burton                                 mail: ross burtonini com
>                                           jabber: ross burtonini com
>                                      www: http://www.burtonini.com./
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