understanding web services. xml wsdl soap and uddi
基础的WebServices（假定你没有EAI背景，最好在涉入SOA之前阅读这两本书)EnterpriseApplicationIntegrationAddison-WesleyInformationTechnologySeries)byDavidS.LinthicumNextGenerationApplicationIntegration:FromSimpleInformationtoWebServicesbyDavidS.Linthicum
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this document is easy-to-understand and suits for beginners.