(PECL yaz >= 0.9.0)
Prepares for an Extended Service Request
void yaz_es ( resource $id , string $type , array $args )
This function prepares for an Extended Service Request. Extended Services is family of various Z39.50 facilities, such as Record Update, Item Order, Database administration etc.
Note:
Many Z39.50 Servers do not support Extended Services.
The yaz_es() creates an Extended Service Request packages