SRU (Search/Retrieve via URL) -- a standard search protocol for Internet search queries.
CQL (Contextual Query Language) -- standard query syntax for representing queries.
Both are based on Z39.50 semantics.
This page provides information about Z39.50 resources, the maintenance of the Z39.50 standard, and the implementation and use of Z39.50: a client/server based protocol for searching and retrieving information from remote databases.
"Z39.50" refers to the International Standard, ISO 23950: "Information Retrieval (Z39.50): Application Service Definition and Protocol Specification", and to ANSI/NISO Z39.50. The Library of Congress is the Maintenance Agency and Registration Authority for both standards, which are technically identical (though with minor editorial differences).
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