Hello everyone,

I have used the following SPARQL query to get the airports in Vancouver, but could not found the same for Montreal, it gave me empty answer.

 PREFIX dbpo: <http://dbpedia.org/ontology/>
 SELECT distinct ?VancouverAirportsA as ?VancouverAirports
 ?VancouverAirportsA a dbpo:Airport.
 FILTER (REGEX (STR (?VancouverAirportsA),"Vancouver")) .

again, the above query used to find the data for Vancouver Airports and it gave me the right answer that I am looking for. I was trying the same query after modifying it to Montreal but I did not get anything.

I also tried to used the another rdf which is


but I faced a problem with the (%) sign.

I also tried to use the following link


but did not work as well because there is a space between airport and Montreal in the URI.

I really need your help guys.

asked 07 Mar '12, 16:51

MR%20BIG's gravatar image

accept rate: 0%

Isn't it more effective to utilise the dbpo:location property for that issue, since REGEX filters are expensive, so you would have a query like the following one:

PREFIX dbpo: <http://dbpedia.org/ontology/>
PREFIX dbp: <http://dbpedia.org/resource/>

SELECT distinct ?MontrealAirport
    ?MontrealAirport a dbpo:Airport ;
        dbpo:location dbp:Montreal .
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This answer is marked "community wiki".

answered 08 Mar '12, 02:43

zazi's gravatar image

accept rate: 13%

Thank you so much everyone who took a look on this question,

I have solved the problem which was in the "Montreal" word. It was written in French like "Montréal" but the SPARQL query does not accept the French letters. So I wrote Montreal "Montr%C3%A9al" to get the result.

PREFIX dbpo: <http://dbpedia.org/ontology/>
SELECT distinct ?MontrealAirportsA as ?MontrealAirports
?MontrealAirportsA a dbpo:Airport.
FILTER (REGEX (STR (?MontrealAirportsA),"Montr%C3%A9al")).

I wrote this answer which might help some one else.


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answered 07 Mar '12, 19:10

MR%20BIG's gravatar image

accept rate: 0%

Thank you for posting the solution. As far as i understand you can mark your own answer as accepted.

(07 Mar '12, 21:11) oesxyl oesxyl's gravatar image

Thank you zazi for your response, your solution is better but does not give me the whole data. But combining your idea with mine, it will give use the thing that we are looking for.

Please see the result of the following query.

PREFIX onto: <http://dbpedia.org/ontology/>
PREFIX resu: <http://dbpedia.org/resource/>
PREFIX yago: <http://dbpedia.org/class/yago/>

SELECT Distinct ?MontrealAitportsC as ?MontrealAitports

{?MontrealAitportsC a onto:Airport .
{?MontrealAitportsC onto:location resu:Montreal .} UNION
{?MontrealAitportsC onto:location ?street .
?street a yago:StreetsInMontreal .} UNION
{?MontrealAitportsC rdf:type onto:Airport
FILTER (REGEX (STR (?MontrealAitportsC ),"Montr%C3%A9al"))}}

I am posting this in case that anyone might get benefits from it.

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answered 09 Mar '12, 23:20

MR%20BIG's gravatar image

accept rate: 0%

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question asked: 07 Mar '12, 16:51

question was seen: 1,342 times

last updated: 09 Mar '12, 23:20