Re: [Tracker] Result of GetMetadata DBUS Method

[Nikolaus Rath <Nikolaus rath org>]

Adrien Bustany <abustany-rDKQcyrBJuzYtjvyW6yDsg public gmane org> writes:
> Le Sun, 18 Sep 2011 12:33:13 -0400,
> Nikolaus Rath <Nikolaus-BTH8mxji4b0 public gmane org> a Ãcrit :
>
> > Adrien Bustany <abustany-rDKQcyrBJuzYtjvyW6yDsg-XMD5yJDbdMReXY1tMh2IBg public gmane org>
> > writes:
> > > Le Sat, 17 Sep 2011 11:32:55 -0400,
> > > Nikolaus Rath <Nikolaus-BTH8mxji4b0-XMD5yJDbdMReXY1tMh2IBg public gmane org> a Ãcrit :
> > > > > Hi Nikolaus
> > > > >
> > > > > On Sat, Sep 17, 2011 at 12:56 AM, Nikolaus Rath
> > > > > <Nikolaus-BTH8mxji4b0-XMD5yJDbdMReXY1tMh2IBg public gmane org> wrote:
> > > > > > Hello,
> > > > > >
> > > > > > In tracker 0.8.17, an example result of the GetMetadata DBUS
> > > > > > method
> > > > > is
> > > > > > Âa nfo:PaginatedTextDocument ;
> > > > > > Â Â Â Â nie:title "SV Meldung" ;
> > > > > > Â Â Â Â nco:creator [ a nco:Contact ;
> > > > > > Â Â Â Â nco:fullname "nikratio"] ;
> > > > > > Â Â Â Â nie:contentCreated "2011-08-10T20:12:38Z" ;
> > > > > > Â Â Â Â nao:hasTag [ a nao:Tag ;
> > > > > > Â Â Â Â nao:prefLabel "()"] ;
> > > > > > Â Â Â Â dc:format "application/pdf" ;
> > > > > > Â Â Â Â nie:description "()" ;
> > > > > > Â Â Â Â nfo:pageCount 1 ;
> > > > > > Â Â Â Â nie:plainTextContent "blablabla" .
> > > > > >
> > > > > > With tracker 0.10.21, however, the same document now gives
> > > > > >
> > > > > > Âa nfo:PaginatedTextDocument ;
> > > > > > Â Â Â Â nie:title "SV Meldung" ;
> > > > > > Â Â Â Â nco:creator [ a nco:Contact ;
> > > > > > Â Â Â Â nco:fullname "nikratio"] ;
> > > > > > Â Â Â Â nie:contentCreated "2011-08-10T20:12:38Z" ;
> > > > > > Â Â Â Â dc:format "application/pdf" ;
> > > > > > Â Â Â Â nie:description "()" ;
> > > > > > Â Â Â Â nao:hasTag ?tag1 ;
> > > > > > Â Â Â Â nfo:pageCount 1 ;
> > > > > > Â Â Â Â nie:plainTextContent "blablabla" .
> > > > > > } } WHERE { {
> > > > > > ?tag1 a nao:Tag ; nao:prefLabel "()" .
> > > > > >
> > > > > >
> > > > > > I don't know enough about the syntax used here, so I won't claim
> > > > > > that it's wrong. However, rdflib fails to parse this and thus
> > > > > > breaks my application.
> > > > > >
> > > > > > Can someone tell me if this is a bug in tracker or in rdflib?
> > > > >
> > > > > Could you share the error message that rdflib gives you?
> > > >
> > > > Sure, it's at http://code.google.com/p/rdflib/issues/detail?id=190
> > >
> > > Most likely rdflib doesn't like the fact that the WHERE of the
> > > INSERT is not closed?
> >
> > That would be my guess too. But I'm surprised to find a WHERE in the
> > GetMetadata output in the first place. What is it good for, and why
> > is it only included for some documents?
>
> The where is here to reuse an existing tag.
>
> INSERT { a tag with label "foo" }
> INSERT { file has tag ?tag } WHERE { ?tag has label "foo" }
>
> You can think of it as a sort of secondary key...
> I guess it's only included for documents which have tags?

Can a document have tags if they have never been added with tracker-tag
(or some frontend)? The WHERE clause is included for freshly created
documents that have certainly not been tagged manually.

Best,

   -Nikolaus

-- 
 ÂTime flies like an arrow, fruit flies like a Banana.Â

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