SWR Search/Retrieve Web Service
The Library of Congress,
Oct 07, 2005
"The SRW/U protocol uses easily available technologies -- XML, SOAP, HTTP, URI -- to perform tasks traditionally done using proprietary solutions; it can be carried either via SOAP (SRW) or as a URL (SRU)." For example, this site demonstrates and documents using SRW to access a Z39.50 database. I don't view these really as harvesting protocols (though I suppose in theory they could be used that way). They are mostly systems for expressing queries; "The query is represented in CQL, the 'Common Query Language', designed for human readable, human writeable, intuitive queries."
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