Hello,
That is interesting. Does this mean that any pragma can be made implicit
in SPARQL queries? Could it be used for 'DEFINE input:inference' too,
making some inference rules to be applied always when certain graphs are
queried?
Regards,
Frans
On 2014-05-14 16:50, Kingsley Idehen wrote:
Excerpt from a private exchange re., the above that I am making
public, due to its importance.
Issue: given the underspecification of SPARQL DESCRIBE, and the
plethora of pragmas that Virtuoso offers re., DESCRIBE, how to I make
my preference the default for a my Virtuoso instance(s)?
Read on...
On 5/14/14 6:07 AM, Jesús Redondo wrote:
On Fri, May 9, 2014 at 3:31 PM, Kingsley Idehen
<kide...@openlinksw.com <mailto:kide...@openlinksw.com>> wrote:
On 5/9/14 7:48 AM, Jesús Redondo wrote:
Hello,
I have the same problem. I have a SPARQL Endpoint:
http://opendata.caceres.es/sparql and there are resources that
are described in more than one graph.
For instance:
http://opendata.caceres.es/recurso/urbanismo-infraestructuras/vias/Via/avda_3425
Get these outputs depending on the Describe query:
*1)* With the default describe I get these triples:
Query:
describe
<http://opendata.caceres.es/recurso/urbanismo-infraestructuras/vias/Via/avda_3425>
Output:
http://opendata.caceres.es/sparql?default-graph-uri=&query=describe+%3Chttp%3A%2F%2Fopendata.caceres.es%2Frecurso%2Furbanismo-infraestructuras%2Fvias%2FVia%2Favda_3425%3E&format=text%2Fx-html%2Btr&timeout=0&debug=on
*2)* With the CBD (sql:describe-mode "CBD) I get these triples:
Query:
/DEFINE sql:describe-mode "CBD"
describe
<http://opendata.caceres.es/recurso/urbanismo-infraestructuras/vias/Via/avda_3425>/
Output:
http://opendata.caceres.es/sparql?default-graph-uri=&query=DEFINE+sql%3Adescribe-mode+%22CBD%22%0D%0Adescribe+%3Chttp%3A%2F%2Fopendata.caceres.es%2Frecurso%2Furbanismo-infraestructuras%2Fvias%2FVia%2Favda_3425%3E&format=text%2Fx-html%2Btr&timeout=0&debug=on
*3)* When I use an ordinary describe with "FROM GRAPH" I get
these triples:
Query:
describe
<http://opendata.caceres.es/recurso/urbanismo-infraestructuras/vias/Via/avda_3425>
FROM NAMED
<http://opendata.caceres.es/recurso/urbanismo-infraestructuras/vias/Via/>
FROM NAMED
<http://opendata.caceres.es/recurso/transporte/plazas/PlazaMovilidadReducida/>
Output:
http://opendata.caceres.es/sparql?default-graph-uri=&query=describe+%3Chttp%3A%2F%2Fopendata.caceres.es%2Frecurso%2Furbanismo-infraestructuras%2Fvias%2FVia%2Favda_3425%3E%0D%0AFROM+NAMED+%3Chttp%3A%2F%2Fopendata.caceres.es%2Frecurso%2Furbanismo-infraestructuras%2Fvias%2FVia%2F%3E%0D%0AFROM+NAMED+%3Chttp%3A%2F%2Fopendata.caceres.es%2Frecurso%2Ftransporte%2Fplazas%2FPlazaMovilidadReducida%2F%3E&format=text%2Fx-html%2Btr&timeout=0&debug=on
This third output is the one I am interested in. _The problem is
that I am using pubby[1] to make the URI of the resources
resolvable, so I cannot include the "FROM GRAPH" clauses._ I
mean there is no way I can modify the Query that runs
internally, so...
*Is there a way to force describe to fetch from all the Graphs
using the default mode?*
If that were not possible, then as a "lesser evil"...
*Is there a way to force virtuoso to CBD mode for all describe
queries?*
Thanks
Jesús
Clearly missing from our online docs is the following:
You can place any 'define pragma' configuration options in
SH_DEFINES field of appropriate row of DB.DBA.SYS_SPARQL_HOST
table . Basically, this is how you achieve your goal.
BTW -- can I have this response shared with the public Virtuoso
list, as I suspect others are encountering this problem .
Table Definition:
create table "DB"."DBA"."SYS_SPARQL_HOST"
(
"SH_HOST" VARCHAR,
"SH_GRAPH_URI" VARCHAR,
"SH_USER_URI" VARCHAR,
"SH_DEFINES" LONG VARCHAR,
"SH_BASE_URI" VARCHAR,
PRIMARY KEY ("SH_HOST")
);
Query from one of my instances:
SELECT SH_HOST,SH_GRAPH_URI,SH_USER_URI,SH_DEFINES,SH_BASE_URI
FROM DB.DBA.SYS_SPARQL_HOST
Result
SH_HOST VARCHAR SH_GRAPH_URI VARCHAR SH_USER_URI VARCHAR
SH_DEFINES LONG VARCHAR SH_BASE_URI VARCHAR
* <DB NULL>
<DB NULL> define sql:gs-app-callback "ODS" <DB NULL>
--
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
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