Hi Таня,
As you indicate using the Virtuoso Open Source 6.1 packages shipped with
debian, which are 6.1.2 builds from about a year ago, I would suggest you
upgrade this to the latest 6.1.3 builds from March of this year, as detailed at:
http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VOSBuild#Specific%20Linux%20Distributions
There are a number of fixes in 6.1.3 for sponger pragmas and crawlers as well
as SPARQL-FED support you would benefit from and may resolve these issues you
are having ...
Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support
Twitter: http://twitter.com/OpenLink
On 29 Jun 2011, at 02:52, Таня Тарасова wrote:
> Hello dear Virtuoso-users!
>
> I am a newbie in Virtuoso, and I am seeking for your advises since I didn't
> manage to solve my problem with the Virtuoso documentation I considered
> relevant. So probably you may point out what I am doing wrong or where I
> could look for more detail. I would appreciate any help!
>
> I am using Virtuoso Open Source Edition v.6.1( from debian packages). I am
> using its native quad store to store my RDF files and to post queries against
> its SPARQL-endpoint to mash-up data from my files with the data from external
> data sets. My Virtuoso instance is running locally.
>
> I was following tutorials [1], [2] and 16.2 Section [3] from the Virutoso
> documentation to construct queries which would retrieve data from my local
> graphs and DBpedia. I was also looking at the example queries from [4]. But
> still I think I am missing something regarding what different "grab-" pragmas
> do.
>
> For example, in my data sets I have statistical data about cities and I set
> up "owl:sameAs" links to the DBpedia cities. I want to be able to retrieve
> "geo:lat" and "geo:long" values for my cities from DBpedia.
>
> I tried the following pragmas:
>
> 1) "grab-var":
>
> define input:grab-var "dbpediaConcept"
>
> 2) "same-as" + "grab-follow-predicate"
>
> define input:same-as "yes"
> define input:grab-follow-predicate geo:lat
> define input:grab-follow-predicate geo:long
>
> 3) "grab:all"
>
> define input:grab-all "yes"
>
> And the query itself is:
> select distinct ?myConcept ?lat ?long
> where
> {?myConcept owl:sameAs ?dbpediaConcept .
>
> ?dbpediaConcept <http://www.w3.org/2003/01/geo/wgs84_pos#lat> ?lat ;
>
> <http://www.w3.org/2003/01/geo/wgs84_pos#long> ?long .
> }
>
> But with these queries I returned only subset of "myConcept". The simplest
> explanation is that "owl:sameAs" links were set up wrong. But I checked
> them...and I run the same federated query which did return all the data from
> my data sets bounded with the DBpedia data:
>
> select * where
> {
> SERVICE <http://dbpedia.org/sparql>
>
> {?x <http://www.w3.org/2003/01/geo/wgs84_pos#lat> ?lat ;
> <http://www.w3.org/2003/01/geo/wgs84_pos#long> ?long .}
>
> ?myConcept owl:sameAs ?x .
> }
>
> I believe I am missing some other pragmas in my extended SPARQL queries or I
> am using them wrong? I would greatly appreciate if you could advise me what I
> am doing wrong...
>
> Thank you,
> Tatiana
>
> [1]
> http://www.openlinksw.co.uk/virtuoso/Whitepapers/html/VirtSpongerWhitePaper.html#AncSPARQL1
> [2]
> http://www.openlinksw.co.uk/virtuoso/Whitepapers/html/VirtSpongerWhitePaper.html#AncSPARQL2
> [3] http://docs.openlinksw.com/virtuoso/rdfiridereferencing.html
> [4]
> http://virtuoso.openlinksw.com/presentations/SPARQL_Tutorials/SPARQL_Tutorials_Part_7/SPARQL_Tutorials_Part_7.html#(24)
> ------------------------------------------------------------------------------
> All of the data generated in your IT infrastructure is seriously valuable.
> Why? It contains a definitive record of application performance, security
> threats, fraudulent activity, and more. Splunk takes this data and makes
> sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-d2d-c2_______________________________________________
> Virtuoso-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/virtuoso-users
