mmm Tiene algo que ver el tema con Yaz ?
http://www.php.net/manual/en/ref.yaz.php Cita: This extension offers a PHP interface to the YAZ™ toolkit that implements the Z39.50 protocol for information retrieval. With this extension you can easily implement a Z39.50 origin (client) that searches or scans Z39.50 targets (servers) in parallel.
No sé si será lo mismo ..ahí les dejo la info...
Un saludo,