public function removeStatement($subject, $predicate, $object, $language)
    {
        $returnValue = (bool) false;

        
        $dbWrapper 	= core_kernel_classes_DbWrapper::singleton();
    
        $query = "DELETE FROM statements WHERE subject = ?
        			AND predicate = ? AND object = ?
        			AND (l_language = ? OR l_language = '')";

        $returnValue = $dbWrapper->exec($query, array(
       		$subject,
       		$predicate,
       		$object,
       		$language
        ));
        
        

        return (bool) $returnValue;
    }