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
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