yaz_scan_result() returns terms
and associated information as received from the target in the
last performed yaz_scan(). This function returns an array
(0..n-1) where n is the number of terms returned. Each value
is a pair where first item is term, second item is
result-count. If the result
is given it will be modified to hold additional information
taken from the Scan Response: number
(number of entries returned),
stepsize (Step-size), position
(position of term), status (Scan
Status).