/**
* @return array
*/
public function namespaces()
{
return RdfNamespace::namespaces();
}
/**
* Adds missing prefix-definitions to the query
*
* Overriding classes may execute arbitrary query-alteration here
*
* @param string $query
* @return string
*/
protected function preprocessQuery($query)
{
// Check for undefined prefixes
$prefixes = '';
foreach (RdfNamespace::namespaces() as $prefix => $uri) {
if (strpos($query, "{$prefix}:") !== false and strpos($query, "PREFIX {$prefix}:") === false) {
$prefixes .= "PREFIX {$prefix}: <{$uri}>\n";
}
}
return $prefixes . $query;
}
