OID value: 1.2.840.10003
This standard specifies a client/server based protocol for Information Retrieval. It specifies procedures and structures for a client to search a database provided by a server, retrieve database records identified by a search, scan a term list, and sort a result set. Access control, resource control, extended services, and a "help" facility are also supported. The protocol addresses communication between corresponding information retrieval applications, the client and server (which may reside on different computers); it does not address interaction between the client and the end- user.
URL for further info: http://lcweb.loc.gov/z3950/agency/
See also the OID Repository website reference for 1.2.840.10003