Re: [Tracker] Ontology addition for media files

[Ivan Frade <ivan frade gmail com>]

Hi,

On Wed, Mar 23, 2011 at 3:35 PM, Lionel Landwerlin
<lionel g landwerlin linux intel com> wrote:
> Hi all,
>
> I have this use case where a multimedia application would like to
> restart an already played stream at the last played position.
> I'm also interested in having the play count and the last played
> date/time.
> At the moment there is no such property to store that kind of
> information on media files.

 I think it makes sense to share that information between apps. Maybe
a 3rd party wants to add a player and respect those values.

> To test my use case in the application I quickly added the following
> properties in the tracker ontology (but I know it's not the right
> place) :
>
> tracker:lastPlayPosition a rdf:Property ;
>        nrl:maxCardinality 1 ;
>        rdfs:domain nfo:Media ;
>        rdfs:range xsd:integer .

I think it is ok in Media (even when it doesn't make sense for
Images). What is the unit of that integer? seconds? milliseconds?

> tracker:lastPlayDate a rdf:Property ;
>        nrl:maxCardinality 1 ;
>        rdfs:domain nfo:Media ;
>        rdfs:range xsd:dateTime .

 You should use nie:contentAccessed. The atime of the file should be
under nfo:fileLastAccesed.

> tracker:playCount a rdf:Property ;
>        nrl:maxCardinality 1 ;
>        rdfs:domain nfo:Media ;
>        rdfs:range xsd:integer .
 This is nie:usageCounter.

 Regards,

Ivan