The Z39.50 protocol, a mature and widely used protocol for retrieving data from remote databases, has been converted into a much simpler web service. As the article describes it, the new protocol, SRW, "doesn't have notions of connection, session or state. It simply makes use of the request - response model that practically all the web uses. Even better, queries can be sent out to databases encoded in plain URLs (hence the SRU bit), even if the response will be in SOAP."
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