Re: [Tracker] tracker-sparql dbus sparql results

[Ivan Frade <ivan frade gmail com>]

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/

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