Mohamed,
That's gorgeous. After I sent the first email, I came up with:
SELECT ?c ?t {?c a ?t. FILTER(?c = dbpedia:Barack_Obama || ?c =
dbpedia:United_States || ...)}
But this seems even faster (is that known as a fact?). Thanks a lot.
Dimitris,
Thanks but I need to serve the data through Virtuoso.
On Thu, Dec 13, 2012 at 1:09 PM, Mohamed Morsey
<[email protected]> wrote:
> Hi Parsa,
>
>
> On 12/13/2012 01:20 PM, Parsa Ghaffari wrote:
>
> Hi folks,
>
> What's the best way to retrieve types (rdf:type) of a large amount of
> concepts, in association with the concept itself? For instance:
>
> [Barack_Obama:Person, United_States:Place,...]
>
> I came up with this query:
>
> SELECT ?c ?t {
> {<concept1> a ?t. <concept1> foaf:isPrimaryTopicOf ?c} UNION
> {<concept2> a ?t. <concept2> foaf:isPrimaryTopicOf ?c} UNION
> .
> .
> . <== repeat for all concepts
> }
>
> Which outputs the desired result but: 1. it's slow (takes ~2.3s for
> 200 concepts) 2. it doesn't go beyond 200-something concepts because
> apparently there's a limit on the number of nested subqueries in a
> query.
>
> Is there a better way to accomplish this?
>
>
> Try to use the "IN" operator, that might help, as follows:
>
> SELECT ?article ?type where {
> {?resource a ?type. ?resource foaf:isPrimaryTopicOf ?article
> .filter(?resource IN (dbpedia:Barack_Obama, dbpedia:United_States, ....)}
> }
>
>
>
> Regards,
>
> Parsa
>
>
>
> --
> Kind Regards
> Mohamed Morsey
> Department of Computer Science
> University of Leipzig
--
Parsa Ghaffari
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