Description
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 and puts it into a queue of operations.
Use yaz_wait() to send the request(s) to the server.
After completion of yaz_wait() the result of
the Extended Service operation should be expected with
a call to yaz_es_result().