Generally speaking to be valid SPARQL syntax any expressions either in the
project clause or in GROUP BY/ORDER BY/FILTER etc should be properly bracketed
and aliased (for project expressions) e.g.
SELECT (<bif:year>(?date) AS ?year) (<bif:month>(?date) AS ?month)
(count(distinct ?document) AS ?documents)
{
?document a :Document;
:documentDateOfCreation ?date;
:documentType ?docType.
FILTER ( ?docType = "exam results"^^xsd:string )
}
group by (<bif:year>(?date)) (<bif:month>(?date))
Try the above and see if that works
Rob Vesse -- YarcData.com<http://YarcData.com> -- A Division of Cray Inc
Software Engineer, Bay Area
m: 925.960.3941 | o: 925.264.4729 | @:
[email protected]<mailto:[email protected]> | Skype: rvesse
6210 Stoneridge Mall Rd | Suite 120 | Pleasanton CA, 94588
[cid:[email protected]]
On Mar 22, 2012, at 11:43 AM, Diogo FC Patrao wrote:
SELECT <bif:year>(?date) <bif:month>(?date) count(distinct ?document)
{
?document a :Document;
:documentDateOfCreation ?date;
:documentType ?docType.
FILTER ( ?docType = "exam results"^^xsd:string )
}
group by <bif:year>(?date) <bif:month>(?date)
