WSDL EXPLAINED
(1)
Chapter #2 and #4
https://www.learnxmlws.com/book/
(2)MSDN ARTICLE
https://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnarxml/html/wsdlexplained.asp
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https://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnarxml/html/wsdlexplained.asp