This function sets sorting criteria and enables Z39.50 Sort.
Call this function before yaz_search(). Using this function alone does not have any effect. When used in conjunction with yaz_search(), a Z39.50 Sort will be sent after a search response has been received and before any records are retrieved with Z39.50 Present (yaz_present().
The connection resource returned by yaz_connect().
A string that takes the form
field1 flags1 field2
flags2 where field1 specifies the primary attributes for
sort, field2 seconds, etc..
The field specifies either a numerical attribute combinations consisting
of type=value pairs separated by comma (e.g.
; or the field may specify a plain string criteria (e.g.
title. The flags is a sequence of the following
characters which may not be separated by any white space.
Case insensitive sorting
Case sensitive sorting