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A communication standard for searching library databases remotely. It is used to copy records for cataloging and to get bibliographic data for citation apps. Sierra is able to use Z39.50 to search other library databases and copy MARC records from them.
https://marmot-support.atlassian.net/l/cp/b0P3zXv4
Sources
Glossary of Cataloging Terms. Norman, Oklahoma: University of Oklahoma, 2014.
Anglo-American Cataloguing Rules. 2nd ed., 1988 rev. Chicago: American Library
Association, 1988.Wynar, Bohdan S. Introduction to Cataloging and Classification. 7th ed., by Arlene G.
Taylor. Littleton, Colo.: Libraries Unlimited, 1985.
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