Hi all,
I noticed two kind of unexpected results when using filters.
For both, I have examples from dbpedia.org sparql endpoint, but I got the same
kind of results from a virtuoso 6.1.5 running on my machine.
The first issue is about language tags that are sometimes missing.
For instance with the following query, there is no xml:lang="fr" in the XML
result, nor a "@fr" in the html display.
However, if the second condition in the filter is uncommented, the tag
reappears!
select *
where{
< http://dbpedia.org/resource/Augustus > rdfs:label ?n
filter (
((?n = 'Auguste'@fr)
#|| (?n = 'Auguste'@fr)
))
}
The second issue seems to be related to the way datatypes are handled.
The http://dbpedia.org/data/Berlin.ntriples contains these two triples among
others:
<http://dbpedia.org/resource/Berlin> <http://dbpedia.org/ontology/elevation>
"34.0"^^<http://www.w3.org/2001/XMLSchema#double>
<http://dbpedia.org/resource/Berlin> <http://dbpedia.org/property/elevation>
"34"^^<http://www.w3.org/2001/XMLSchema#int>
With the following query, I actually get these two results, although both
values are casted to integers
(the xml output contains the attribute
datatype="http://www.w3.org/2001/XMLSchema#integer"; for both) .
When the second condition in the filter is uncommented, only the first results
is returned.
select *
where {
<http://dbpedia.org/resource/Berlin> ?r ?n
filter (
?n=34
#|| ?n=""@en
)
}
Regards,
Julien Cojan
----- Mail original -----
> De: "Pablo Mendes" <[email protected]>
> À: "Julien Cojan" <[email protected]>
> Cc: [email protected]
> Envoyé: Samedi 2 Juin 2012 19:39:58
> Objet: Re: [Dbpedia-developers] bug
> Hi Julien,
> It does not seem to be a problem with XML only. I also see it in the
> HTML output. Looks like you should report to the VOS mailing list:
> http://sourceforge.net/mailarchive/forum.php?f
> orum_name=virtuoso-users
> The query below also returns @fr
> select *
> where{
> < http://dbpedia.org/resource/Augustus > rdfs:label ?n
> filter (
> ((?n = 'Auguste'@fr)
> || (?n = 'Augustin'@fr))
> )
> }
> And this other fails:
> select *
> where{
> < http://dbpedia.org/resource/Augustus > rdfs:label ?n
> filter (
> (?n = 'Auguste'@fr)
> )
> }
> Cheers,
> Pablo
> On Fri, Jun 1, 2012 at 6:47 PM, Julien Cojan < [email protected]
> > wrote:
> > Hi all,
>
> > While trying some queries on dbpedia I noticed a strange behavior
> > of
> > the XML output with string litterals.
>
> > I believe this is a bug of Virtuoso, should I report this on some
> > other mailing list ?
>
> > For instance on dbpedia.org , with the first request
>
> > select *
>
> > where{
>
> > ?x rdfs:label ?n
>
> > filter (
>
> > ((?x = < http://dbpedia.org/resource/Augustus >) && (?n =
> > 'Auguste'@fr))
>
> > )
>
> > }
>
> > there is no lang attribute on the litteral node <binding name="n">
> > <literal> Auguste</literal></binding>
>
> > Whereas if a second condition is added :
>
> > select *
>
> > where{
>
> > ?x rdfs:label ?n
>
> > filter (
>
> > ((?x = < http://dbpedia.org/resource/Augustus >) && (?n =
> > 'Auguste'@fr))
>
> > || ((?x = <http://dbpedia.org/resource/Augustin> ) && (?n =
> > || 'Augustin'@fr))
>
> > )
>
> > }
>
> > The attribute lang appears : <binding name="n"> <literal
> > xml:lang="fr"> Auguste</literal></binding>
>
> > Cheers,
>
> > Julien
>
> > > De: "Olivier Corby" < [email protected] >
> >
>
> > > À: "julien cojan" < [email protected] >
> >
>
> > > Envoyé: Mercredi 23 Mai 2012 11:41:06
> >
>
> > > Objet: bug
> >
>
> > > select *
> >
>
> > > where
> >
>
> > > {
> >
>
> > > service <http://dbpedia.org/sparql> {
> >
>
> > > {?x rdfs:label ?n . }
> >
>
> > > filter (
> >
>
> > > #((?x = <http://dbpedia.org/resource/Augustin> ) && (?n =
> > > 'Augustin'@fr))
> >
>
> > > #||
> >
>
> > > ((?x = <http://dbpedia.org/resource/Augustus> ) && (?n =
> > > 'Auguste'@fr))
> >
>
> > > )
> >
>
> > > }
> >
>
> > > }
> >
>
> > ------------------------------------------------------------------------------
>
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> > Discussions
>
> > will include endpoint security, mobile security and the latest in
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>
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>
> > _______________________________________________
>
> > Dbpedia-developers mailing list
>
> > [email protected]
>
> > https://lists.sourceforge.net/lists/listinfo/dbpedia-developers
>
