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isaphttp://webisa.webdatacommons.org/prov/
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Now, I personally think he is a Web service, mostly because of the application to application flavor. I would not call it a "W3C Web service", since it does not use WSDL and SOAP -- but it seems pretty Web service-ey to me. I would personally call it an "ad hoc" Web service -- and I would make up another name for ebXML transactions that use SOAP but not WSDL, since it s
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