Hi Quentin,
Thanks for the input, I see what you mean as the jena program is executing the
query:
String qStr = "PREFIX base: <http://base.org#> PREFIX xsd:
<http://www.w3.org/2001/XMLSchema#> SELECT ?s {?s base:name
\"test_sensor\"^^xsd:string}";
and does actually return results when run against isql:
SQL> SPARQL define input:default-graph-uri <testGraph> PREFIX xsd:
<http://www.w3.org/2001/XMLSchema#> PREFIX base: <http://base.org#> SELECT
?s WHERE { ?s base:name "test_sensor"^^xsd:string };
s
LONG VARCHAR
_______________________________________________________________________________
http://base.org#xxxxx1
http://base.org#xxxxx2
2 Rows. -- 101 msec.
SQL>
But when I set Virtuoso trace_on() ^^xsd:string element is being stripped off
by time it gets to Virtuoso ie
define input:default-graph-uri <testGraph>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX base: <http://base.org#>
SELECT ?s
WHERE
{ ?s base:name "test_sensor" }
which I assume must be done by the Jena Provider, thus we need to check this ...
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
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Universal Data Access, Integration, and Management Technology Providers
> On 25 Jan 2018, at 02:27, Quentin <quentin@guidinghand.solutions> wrote:
>
> Hi Hugh,
>
> In your example, you have this query:
>> SELECT ?s WHERE { ?s base:name "test_sensor" };
>
> But the data is:
> s
> o
> datatype
> LONG VARCHAR
> LONG VARCHAR
> LONG VARCHAR
> _______________________________________________________________________________
> http://base.org#xxxxx1
> test_sensor
> http://www.w3.org/2001/XMLSchema#string
>
>
> Would you expect a query for string literals to return xsd typed strings?
> I've always found that filtering or querying over string literals would not
> be successful unless everything was very carefully typed.
>
> I note that Jason tried xsd types in his queries in the first instance, so
> that's probably not actually the issue here.
> --
> Regards,
> Quentin Serrurier.
> GuidingHand.Solutions
>
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