Matters

Z39.50 Resources Directory is a web site devoted to resources about Z39.50, an international standard for information retrieval across heterogenious data sources.
"ANSI/NISO Z39.50 is a communications protocol for information retrieval in a client/server environment. Widely used in bibliographic and digital library applications, Z39.50 represents a significant body of experience relating to bibliographic data retrieval and the specification of interoperable semantics for community-specific metadata attribute sets."