Z39.50 is a standard communications protocol
for the search and retrieval of bibliographic data in online databases. Z39.50 is used on the
Internet to search the Online Public Access Catalogues (OPAC) of
library holdings. It is also sometimes used to link disparate OPACs into a single "union" OPAC.
Z39.50 is an American National Standards Institute (ANSI/NISO)
Contributor(s): Simon Smith
This was last updated in April 2005
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