On 29/10/13 09:27, Bardo Nelgen wrote:
Hello,
this time I'm asking for help with a (to me…) seemingly strange SPARQL
matching behavior:
When trying to match a statement using a language tag, something like
<cnt:versionedContent
rdf:about="http://resources.semaworx.eu/timed/version#versioncrediblyuniqueid001";>
<cnt:i18nslug xml:lang="en-us">home</cnt:i18nslug>
</cnt:versionedContent>
this works quite well with
?Version cnt:i18nslug "home"@en-us .
Though, now, when I target a broader match with
?Version cnt:i18nslug "home" .
(intending to match *any* ?Version having a cnt:i18nslug named "home",
regardless of the language/locale used) it unfortunately does *not*
match *any* of the respective statements.
So: Why does leaving away the language tag in the query obviously imply,
the result *must not* have one, rather than just ignoring the existing
one(s)?
Because in RDF there are "simple literals" - strings without a language
tag at all. They are different to ones having a language tag.
And: How can this effect be avoided?
Test the lexical form:
{ ?Version cnt:i18nslug ?x .
FILTER(str(?x) = "home")
}
See also langMatches for, say getting all the "en" ones.
As always, every hint is highly appreciated.
Greets,
Bardo
Andy
