My sincere thanks to those who responded my query seeking opinions regarding
serials holdings statements standard in OPAC.  All responses endorse use of
holdings standard.  I have summarize the responses below:

State University of NY at Buffalo:  They use the ANSI Z39.44-1986 Standard
along with USMARC Holdings Format in their NOTIS system.  Recommended to
develop examples and interpretations before start following the Standards.

>From AT&T Bell Laboratories:  They also incorporate the Z39.44 Standard,
along with the USMARC Holdings Format, in their own serials control system.
They use ANSI level 3 for retrospective holdings strings; ANSI level 4 after
they have implemented their automated check-in system.  Recommended reading
ANSI/NISO Z39.71-199X to supplement Z39.44.

>From Western Carolina University:  Recommended the use of level 4 of ANSI
Standard.  Their OPAC system is INNOPAC.

>From UGA:  Looking for possible availability of programming routines that
can implement Z39.44.

Once again, thank you for the responses.

Ming-Kan Wong
Serials Librarian
Hong Kong University of Science and Technology
email: lbmkwong@usthk.ust.hk