(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0) Returns error description
(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0) Prepares for a connection to a Z39.50 server
(PHP 4 >= 4.2.0, PECL yaz >= 0.9.0) Specifies schema for retrieval
(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0) Returns number of hits for last search
(PECL yaz >= 0.9.0) Returns value of option for connection
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