Re: [Tracker] RDF Queries

[Martyn Russell <martyn imendio com>]

Michael Lissner wrote:
> Huh. I played with this a bit more today, and it was giving me errors:
>
> executing rdf query <rdfq:Condition>
>    <rdfq:equals>
>        <rdfq:Property name='Audio:Album' />
>        <rdf:String>Plans</rdf:String>
>    </rdfq:equals>
> </rdfq:Condition>

This works for me, perhaps you are calling the API with something that 
causes errors.

This is how I call it:

        tracker_search_query_async (priv->client,
                                    time (NULL),
                                    instance->service_type,
                                    NULL, /* Fields */
                                    NULL, /* Search text */
                                    NULL, /* Keywords */
                                    instance->rdf_query,
                                    instance->current_pos,
                                    ELEMENTS_PER_QUERY,
                                    FALSE, /* Sort by service */
                                    instance->sort_fields,
                                    FALSE, /* Sort descending */
                                    query_get_data_cb,
                                    instance);

Are you calling this function, if so, how?

> I also ran tracker-extract on the mp3 file that I was expecting to get a 
> hit from, and it didn't return any meta data. I'm guessing that means 
> that tracker isn't gathering meta data from music files? If that's true, 
> is it possible to change the config so it will?

This depends on a few things:

1. What extractors are supported - configure should give you a summary 
of that.

2. The MP3 itself. What exactly does tracker-extract output for that 
file if you use:

 /usr/libexec/tracker-extract -v 3 -f /path/to/filename

--
Regards,
Martyn