On 3/17/14 8:04 PM, Quentin wrote:
Hi Hugh,Would:select ?o datatype(?o) from <g1> where {?s ?p ?o . filter (?o = "false"^^xsd:boolean) }return "False xsd:boolean"? Or nothing, because ?o is actually an integer?
Based on:
Data Creation:
with graph <g1>
insert { <strue> <p1> "true"^^xsd:boolean .
<sfalse> <p1> "false"^^xsd:boolean }
Queries:
select * from <g1> where {?s ?p "false"^^xsd:boolean}
and
select * from <g1> where {?s ?p "0"^^xsd:boolean}
?o cannot be an integer, especially as its explicitly typed (as
xsd:boolean) at data creation time. It would only be an integer if it
was typed as xsd:integer at data creation time.
The only time you will run into issues is when, at data creation time, you have the relation object set as xsd:integer or no type at all.
The data creation statement above, doesn't create an integer. Likewise, if it was:
with graph <g1>
insert { <strue> <p1> "1"^^xsd:boolean .
<sfalse> <p1> "0"^^xsd:boolean }
You will still get the same solution for:
select * from <g1> where {?s ?p "false"^^xsd:boolean}
and
select * from <g1> where {?s ?p "0"^^xsd:boolean} .
--
Regards,
Kingsley Idehen
Founder & CEO
OpenLink Software
Company Web: http://www.openlinksw.com
Personal Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter Profile: https://twitter.com/kidehen
Google+ Profile: https://plus.google.com/+KingsleyIdehen/about
LinkedIn Profile: http://www.linkedin.com/in/kidehen
smime.p7s
Description: S/MIME Cryptographic Signature
------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech
_______________________________________________ Virtuoso-users mailing list Virtuoso-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtuoso-users
