(PHP 4 >= 4.2.0, PECL)
yaz_schema() specifies the schema for retrieval.
This function should be called before
yaz_search() or yaz_present().
The connection resource returned by yaz_connect().
Must be specified as an OID (Object Identifier) in a raw dot-notation
(like 1.2.840.10003.13.4) or as one of the known
registered schemas: GILS-schema,
Holdings, Zthes, ...
No value is returned.