I'm trying to filter this database written in Turtle
@prefix : <http://www.essepuntato.it/resource/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix cs: <http://cs.unibo.it/ontology/> .
:pt0001
vcard:category "Poste e Telegrafi"
; vcard:fn "Ufficio Bologna 1"
; vcard:extended-address "Via Cairoli 9, Bologna BO, Italy"
; vcard:latitude "44.504192"
; vcard:longitude "11.338661"
; vcard:tel "051 243425"
; vcard:fax "051 244459"
; cs:opening "Mon, Tue, Wed, Thu, Fri: 0800-1330. Sat: 0800-1230."
; cs:closing "01-01, 01-06, P, LA, 04-25, 05-01, 06-02, 08-15, 11-01, 12-08, 12-25, 12-26: .".
I use arc2 api beacause the RAP doesn't work. I wrote this code but it won't work:
<?php
/* ARC2 static class inclusion */
include_once('./arc2/ARC2.php');
/* MySQL and endpoint configuration */
$config = array(
/* db */
'db_host' => 'localhost', /* optional, default is localhost */
'db_name' => 'my_db',
'db_user' => 'user',
'db_pwd' => 'secret',
/* store name */
'store_name' => 'my_endpoint_store',
/* endpoint */
'endpoint_features' => array(
'select', 'construct', 'ask', 'describe',
'load', 'insert', 'delete',
'dump' /* dump is a special command for streaming SPOG export */
),
'endpoint_timeout' => 60, /* not implemented in ARC2 preview */
'endpoint_read_key' => '', /* optional */
'endpoint_write_key' => 'somekey', /* optional */
'endpoint_max_limit' => 250, /* optional */
);
/* instantiation */
/* instantiation */
$ssp = ARC2::getSPARQLScriptProcessor($config);
/* script evaluation */
$scr = '
PREFIX vcard: <http://www.w3.org/2006/vcard/ns#>
PREFIX dbpedia2: <http://dbpedia.org/property/>
ENDPOINT "database.ttl"
$rows = SELECT ?x ?y WHERE {
?x vcard: ?y.
}
';
$ssp->processScript($scr);
echo $ssp->env['output'];
?>
The script returns no error and not a result. Could you please find the error? I can't figure it out.
Source: Tips4all
Seems like the predicate in the WHERE {} statement is missing something.
ReplyDeleteFor example did you mean vcard:latitude ?
Currently it is
$rows = SELECT ?x ?y WHERE {
?x vcard: ?y.
}
How about :
$rows = SELECT ?x ?y WHERE {
?x vcard:latitude ?y .
}
And there may be problems if there is no space character before the period. Notice I added that above. At least that's what I experienced when using Python RDF libraries.