This function sets sorting criteria and enables Z39.50 Sort.
Call this function beforeyaz_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().
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. 1=4,2=1)
; 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
No value is returned.
Example 1. Sort Criterias
To sort on Bib1 attribute title, case insensitive, and ascending you
would use the following sort criteria:
If the secondary sorting criteria should be author, case sensitive and
ascending you would use: