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<An Introduction to Web Services ⁄ >




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Web services are becoming more and more popular. If you would like to learn what they are and how you can develop and deploy them, keep reading.

In the first two sections of this article, I'll discuss what web services are and how they work. In the third and fourth sections I'll explain how to develop web services using Apache AXIS and Java.

Let's start learning about web services with the definition for web service as provided by W3C. According to them, a web service is a software application which is identified by a URI, whose interfaces and binding are capable of being defined, described and discovered by XML using XML-based messages via Internet-based protocols.

A web service is usually identified by a URI (Unified Recourse Identifier). A web service has WSDL (Web Service Description Language) definitions. To communicate with web services we need to use SOAP messages, which are XML based messages transported over Internet protocols like HTTP, SMTP, and FTP. Web services can be better described with the following diagram.



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