Re: [Virtuoso-users] Problem with dbpedia.vad
On 7/4/11 3:54 PM, Mohamed Morsey wrote:
Hi,
I'm trying to install dbpedia.vad to work with our DBpedia instance.
The problem now is that I divide DBpedia data into 2 separate graphs one
for static part called "http://static.dbpedia.org";, and one for dynamic
(live) part called "http://live.dbpedia.org";.
I've created a graph group called "'http://dbpedia.org"; that contains
both of these parts.
I execute command "registry_set ('dbp_graph', 'http://dbpedia.org');"
to register the graph group containing DBpedia data.
But, the vad is not working with graph groups, so when I try to access
it for any DBpedia resource I get an empty page.
When I replace the command with "registry_set ('dbp_graph',
'http://live.dbpedia.org');" it works but the page display partial results.
My question is how to get that vad working with a graph group.
Don't use graph groups.
Just install the VAD, and then tweak the SPARQL in the re-write rule
such that it doesn't have FROM anymore.
Install the faceted browser vad to see what I mean.
--
Regards,
Kingsley Idehen
President& CEO
OpenLink Software
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen
Re: [Virtuoso-users] SPARQL sub-query to return a single result
Hello Sebastian,
If ?app always gets exactly one value, what's the purpose in the
subquery?
If you're not sure that ?app is the only (e.g., if triple ?app
nao:identifier "nepomukindexer" can appear in more than one graph), then
you can write, of course,
select distinct ?r where {
graph ?g {
?r nie:url ?url .
} .
?g nao:maintainedBy ?app .
filter (?app = (select ?a where { ?a nao:identifier "nepomukindexer" }))
}
or even shorter
select distinct ?r where {
graph ?g {
?r nie:url ?url .
} .
?g nao:maintainedBy `(select ?a where { ?a nao:identifier "nepomukindexer"
})` .
}
Best Regards,
Ivan Mikhailov
OpenLink Software
http://virtuoso.openlinksw.com
On Mon, 2011-07-04 at 14:42 +0200, Sebastian Trüg wrote:
> Hi list,
>
> in a query like this:
>
> select distinct ?r where {
> graph ?g {
> ?r nie:url ?url .
> } .
> ?g nao:maintainedBy ?app .
> ?app nao:identifier "nepomukindexer" .
> }
>
> I would like to use a sub-query to replace ?app since there is only
> exactly one resource which has this identifier. The simplest possibility
> is to use two queries and cache the resource URI of the app in the
> client. But I figure there could be a fancy sub-query which allowed me
> to query the app in-place.
>
> Is that possible?
>
> Cheers,
> Sebastian
>
> --
> 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
> Virtuoso-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/virtuoso-users
[Virtuoso-users] Problem with dbpedia.vad
Hi,
I'm trying to install dbpedia.vad to work with our DBpedia instance.
The problem now is that I divide DBpedia data into 2 separate graphs one
for static part called "http://static.dbpedia.org";, and one for dynamic
(live) part called "http://live.dbpedia.org";.
I've created a graph group called "'http://dbpedia.org"; that contains
both of these parts.
I execute command "registry_set ('dbp_graph', 'http://dbpedia.org');"
to register the graph group containing DBpedia data.
But, the vad is not working with graph groups, so when I try to access
it for any DBpedia resource I get an empty page.
When I replace the command with "registry_set ('dbp_graph',
'http://live.dbpedia.org');" it works but the page display partial results.
My question is how to get that vad working with a graph group.
--
Kind Regards
Mohamed Morsey
Department of Computer Science
University of Leipzig
[Virtuoso-users] SPARQL sub-query to return a single result
Hi list,
in a query like this:
select distinct ?r where {
graph ?g {
?r nie:url ?url .
} .
?g nao:maintainedBy ?app .
?app nao:identifier "nepomukindexer" .
}
I would like to use a sub-query to replace ?app since there is only
exactly one resource which has this identifier. The simplest possibility
is to use two queries and cache the resource URI of the app in the
client. But I figure there could be a fancy sub-query which allowed me
to query the app in-place.
Is that possible?
Cheers,
Sebastian
Re: [Virtuoso-users] use of "grab-" pragmas
Hi Hugh, yes, I can send my files to you. There are three of them, less than 150 KB in total. How can I send them to you? I'm sorry it's the first time I'm using a mailing list and I'm not sure if it is ok to attach my files to this broadcasting email. Thank you, Tatiana
Re: [Virtuoso-users] Virtuoso RDFXX Error Unknown language
Hello Hugh, yes, you were right the needed id was missing from the DB.DBA.RDF_LANGUAGE table. I started an empty database and that helped, thank you very much for your assistance! Would be good to know why it could happen just to avoid such errors in the future, starting a new database always could be time consuming :( Thank you, Tatiana
