Re: [Tracker] tracker-sparql dbus sparql results

[Philip Van Hoof <philip codeminded be>]

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get_value_type and get_variable_name:

https://git.gnome.org/browse/tracker/tree/src/libtracker-sparql/tracker-cursor.vala#n126

https://git.gnome.org/browse/tracker/tree/src/libtracker-sparql/tracker-cursor.vala#n139

You btw shouldn't use the DBus Resources1 object, but use
libtracker-sparql instead.


Ivan Frade schreef op 17/04/2014 20:14:
> Hi Jürgen,
>
> Yes, tracker does not return bindingNames or types of the resulting
> nodes. It assumes the client takes care of interpreting the results
> of its query.
>
> A workaround would be to parse the SparQL in the wrapper and add
> that information when translating the DBus result set to the
> openrdf format. The binding Names can be added straight forward
> from the SELECT of the query. The type information is more
> complicated to deduce, based on the position in the query and/or
> the rdfs:range of the properties (defined in the ontology).
>
> Regards,
>
> Ivan
>
>
> On Thu, Apr 17, 2014 at 10:11 AM, Jürgen Jakobitsch < 
> j jakobitsch semantic-web at> wrote:
>
> > hi,
> >
> > i'm currently developing an openrdf [1] repository implementation
> > with a tracker-sparql backend via dbus. this will enable java
> > developers to include tracker-sparql results in any application
> > (or create a sparql endpoint) extremly easily. openrdf's api is
> > quite common in the semweb community..
> >
> > everything is working very nice already  the only trouble i'm
> > having is that i get a vector of vectors containing simple
> > strings as a result object, meaning i need to find out types
> > (literals, uris, bnodes, typed literals)..
> >
> > is there any known way to retrieve some more information in the
> > results given via dbus? also bindingNames are missing...
> >
> > any pointer really appreciated wkr turnguard..
> >
> >
> > [1] http://www.openrdf.org/
> >
> > | Jürgen Jakobitsch, | Software Developer | Semantic Web Company
> > GmbH | Mariahilfer Straße 70 / Neubaugasse 1, Top 8 | A - 1070
> > Wien, Austria | Mob +43 676 62 12 710 | Fax +43.1.402 12 35 - 22
> >
> > COMPANY INFORMATION | web       : http://www.semantic-web.at/ |
> > foaf      :
> > http://company.semantic-web.at/person/juergen_jakobitsch PERSONAL
> > INFORMATION | web       : http://www.turnguard.com | foaf      :
> > http://www.turnguard.com/turnguard | g+        :
> > https://plus.google.com/111233759991616358206/posts | skype     :
> > jakobitsch-punkt | xmlns:tg  =
> > "http://www.turnguard.com/turnguard#";
> >
> > _______________________________________________ tracker-list
> > mailing list tracker-list gnome org 
> > https://mail.gnome.org/mailman/listinfo/tracker-list
>
>
>
> _______________________________________________ tracker-list
> mailing list tracker-list gnome org 
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