In the DBpedia SPARQL endpoint <http://dbpedia.org/sparql/> [1], running
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://dbpedia.org/resource/>
PREFIX dbpedia2: <http://dbpedia.org/property/>
SELECT ?a (3+3 AS ?y)
WHERE
{
?a dc:description "English footballer" .
?a dbpedia2:placeOfBirth :Merseyside .
}
Shows all English Footballers who were born in Merseyside, with column y just
displaying the value 6 on every row [result link
<http://dbpedia.org/sparql/?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=++++PREFIX+dc%3A+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E%0D%0A++++PREFIX+%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2F%3E%0D%0A++++PREFIX+dbpedia2%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fproperty%2F%3E%0D%0A%0D%0A++++SELECT+%3Fa+%283%2B3+AS+%3Fy%29%0D%0A++++WHERE+%0D%0A++++%7B+%0D%0A+++++++%3Fa+dc%3Adescription+%22English+footballer%22+.%0D%0A+++++++%3Fa+dbpedia2%3AplaceOfBirth+%3AMerseyside+.%0D%0A++++%7D&format=text%2Fhtml&timeout=30000&debug=on>];
however, the same query
<http://dbpedia.org/snorql/?query=PREFIX+pos%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2003%2F01%2Fgeo%2Fwgs84_pos%23%3E%0D%0APREFIX+dbo%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0A%0D%0ASELECT+%3Fa+%283%2B3+AS+%3Fy%29%0D%0AWHERE+%0D%0A%7B+%0D%0A+++++%3Fa+dc%3Adescription+%22English+footballer%22+.%0D%0A+++++%3Fa+dbpedia2%3AplaceOfBirth+%3AMerseyside+.%0D%0A%7D>
on
the SNORQL endpoint <http://dbpedia.org/snorql/> displays an error:
Virtuoso 37000 Error SP030: SPARQL compiler, line 16: syntax error at '3'
before 'AS' SPARQL query: define sql:big-data-const 0 #output-
format:application/sparql-results+json define input:default-graph-uri PREFIX
owl: PREFIX xsd: PREFIX rdfs: PREFIX rdf: PREFIX foaf: PREFIX dc: PREFIX :
PREFIX dbpedia2: PREFIX dbpedia: PREFIX skos: PREFIX pos: PREFIX dbo: SELECT
?a (3 3 AS ?y) WHERE { ?a dc:description "English footballer" . ?a
dbpedia2:placeOfBirth :Merseyside . }
Even more strangely, using any of the other 3 arithmetic operators *does* work
in the SNORQL endpoint (e.g. with division
<http://dbpedia.org/snorql/?query=PREFIX+pos%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2003%2F01%2Fgeo%2Fwgs84_pos%23%3E%0D%0APREFIX+dbo%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0A%0D%0ASELECT+%3Fa+%283%2F3+AS+%3Fy%29%0D%0AWHERE+%0D%0A%7B+%0D%0A+++++%3Fa+dc%3Adescription+%22English+footballer%22+.%0D%0A+++++%3Fa+dbpedia2%3AplaceOfBirth+%3AMerseyside+.%0D%0A%7D>
[5])
A previous question <http://stackoverflow.com/a/15658884/889604> [6] on
Stackoverflow has implied that the SPARQL and SNORQL endpoints should
return the same result, so what's going on here?!
Cheers,
Chris
1: http://dbpedia.org/sparql/
2:
http://dbpedia.org/sparql/?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=++++PREFIX+dc%3A+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E%0D%0A++++PREFIX+%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2F%3E%0D%0A++++PREFIX+dbpedia2%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fproperty%2F%3E%0D%0A%0D%0A++++SELECT+%3Fa+%283%2B3+AS+%3Fy%29%0D%0A++++WHERE+%0D%0A++++%7B+%0D%0A+++++++%3Fa+dc%3Adescription+%22English+footballer%22+.%0D%0A+++++++%3Fa+dbpedia2%3AplaceOfBirth+%3AMerseyside+.%0D%0A++++%7D&format=text%2Fhtml&timeout=30000&debug=on
3:
http://dbpedia.org/snorql/?query=PREFIX+pos%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2003%2F01%2Fgeo%2Fwgs84_pos%23%3E%0D%0APREFIX+dbo%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0A%0D%0ASELECT+%3Fa+%283%2B3+AS+%3Fy%29%0D%0AWHERE+%0D%0A%7B+%0D%0A+++++%3Fa+dc%3Adescription+%22English+footballer%22+.%0D%0A+++++%3Fa+dbpedia2%3AplaceOfBirth+%3AMerseyside+.%0D%0A%7D
4: http://dbpedia.org/snorql/
5:
http://dbpedia.org/snorql/?query=PREFIX+pos%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2003%2F01%2Fgeo%2Fwgs84_pos%23%3E%0D%0APREFIX+dbo%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0A%0D%0ASELECT+%3Fa+%283%2F3+AS+%3Fy%29%0D%0AWHERE+%0D%0A%7B+%0D%0A+++++%3Fa+dc%3Adescription+%22English+footballer%22+.%0D%0A+++++%3Fa+dbpedia2%3AplaceOfBirth+%3AMerseyside+.%0D%0A%7D
6: http://stackoverflow.com/a/15658884/889604
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