On 12/29/15 12:46 PM, Eng.Bassam wrote: > suppose the geoname resource is: > <gn:Feature rdf:about="http://sws.geonames.org/2378080/";> > <rdfs:isDefinedBy > rdf:resource="http://sws.geonames.org/2378080/about.rdf"/> > <gn:name>Mauritania</gn:name> > </gn:Featue> > > I want to get name of country_geo > select ?o ?cname > where {?s SIO:SIO_000664 ?o; > ?s a foaf:Person. > ?o gn:name ?cname } > limit 10 > > how I can traverse to geonames ontology to get a name property ???
That has nothing to do with R2RML. That's all about de-referencing data
from geonames "on the fly" as part of query processing -- if you don't
have this data loaded locally. If loaded locally, then query above will
return the correct solution for ?cname.
To be extra safe (i.e. query for a solution that includes relations that
have empty gname objects) try:
select ?o ?cname
where {?s SIO:SIO_000664 ?o;
?s a foaf:Person.
OPTIONAL { ?o gn:name ?cname. }
}
limit 10
Kingsley
>
>
> On Tue, Dec 29, 2015 at 6:36 PM, Kingsley Idehen
> <kide...@openlinksw.com <mailto:kide...@openlinksw.com>> wrote:
>
> On 12/29/15 8:31 AM, Eng.Bassam wrote:
>> Hello
>> I have a person pesron table with columns (id, name ,
>> country_geo), person table type in R2RML is foaf:person, I have
>> also loaded geonames onology in my virtuoso server at link
>> http://localhost:8890/ontologies/geonames
>>
>> now for the country_geo column the r2rml is :
>> rr:predicateObjectMap [ rr:predicateMap [ rr:constant
>> SIO:SIO_000664 ] ; rr:objectMap [ rr:column "Country_geo" ]; ] ;
>>
>> the value of country_geo is IRI e.g
>> "http://sws.geonames.org/2378080/"; described in my loaded
>> ontology geonames.
>> now how can I make the generated country_geo property in person
>> refer to my loaded ontology geonames, what should I write in
>> r2rml ???
>> my objective is making sparql queries on the generated views
>> (persons) and traverse to geonames for more info about countries.
>>
>> wish it's clear question :)
>> thanks
>>
>> --
>> -----------------------------------
>> > Eng.Bassam Najeeb.
>> >Software Engineer.
>
> Okay, so have you generated you views and hit a problem? You are
> already mapping Geoname IRIs to country_geo, so your end product
> would be instances of a class that have IRI property values from
> the geonames ontology. Net effect, from your SPARQL DESCRIBE,
> SELECT, or CONSTRUCTs on the foaf:Person instances you will be
> able to follow-your-nose through SIO:SIO_000664 property values.
>
> select ?o
> where {?s SIO:SIO_000664 ?o;
> ?s a foaf:Person. }
> limit 10
>
>
> Kingsley
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>>
>>
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>
> --
> Regards,
>
> Kingsley Idehen
> Founder & CEO
> OpenLink Software
> Company Web: http://www.openlinksw.com
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> --
> -----------------------------------
> > Eng.Bassam Najeeb.
> >Software Engineer.
>
>
>
> ------------------------------------------------------------------------------
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--
Regards,
Kingsley Idehen
Founder & CEO
OpenLink Software
Company Web: http://www.openlinksw.com
Personal Weblog 1: http://kidehen.blogspot.com
Personal Weblog 2: http://www.openlinksw.com/blog/~kidehen
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