Obtaining start and end date from a DBPedia Career

问题:

I am trying to write a query that will return my all CareerStation objects that are associated with Arsenal FC. Then I want to be able to get the start and end dates of these CareerStations, currently I can only get the start date. It may be that only the start date is in the DB but this doesn't make much sense to me. Also I would like to know if there is a way of formatting the date so to remove the parts that aren't the actual year.

Thanks in advance for any pointers.

PREFIX p: <http://dbpedia.org/property/>

select *

where {

    ?careerStation <http://dbpedia.org/ontology/team>     
    <http://dbpedia.org/resource/Arsenal_F.C.> .
    ?careerStation <http://dbpedia.org/ontology/years> ?year

}

order by ?player

Can see query in action here