Re: Querying resources' strings, whatever the lang tag

[Andy Seaborne]

On 26/03/14 10:01, Olivier Rossel wrote:
Hello.
I have a question about matching strings in SPARQL, whatever the lang tag.
As far as I understand, the only way to do that is to let SPARQL bind a
  ?variable
and then FILTER for equality of its str() against my matching string value.

In SPARQL 1.1, yes.

For example:

SELECT ?person ?name
   WHERE
   {
   ?person foaf:name ?name .
   FILTER (str(?name) = "Jackie Chan") .
   }

Is it really the only way?
Won't it perform really bad?
Especially compared to the case where you know the lang tag:


SELECT ?person ?name
   WHERE
   {
   ?person foaf:name "Jackie Chan"@en
   }



This is what a text index is good for.  Get some limited possibilities 
and test accurately in SPARQL:

(hurrily...)

?x text:query ('Jackie Chan') .
?x foaf:name ?name .
FILTER (str(?name) = "Jackie Chan") .

        Andy