Chapter 22. Web Services

A client is to me a mere unit, a factor in a problem.

— Sir Arthur Conan Doyle

...if the simplest things of nature have a message that you understand, rejoice, for your soul is alive.

— Eleonora Duse

Protocol is everything.

— Francoise Giuliani

They also serve who only stand and wait.

— John Milton

Objectives

In this chapter you will learn:

  • What a Web service is.

  • How to create Web services.

  • The important part that XML and the XML-based Simple Object Access Protocol play in enabling Web services.

  • The elements that comprise Web services, such as service descriptions.

  • How to create a client that uses a Web service.

  • How to use Web services with Windows applications and Web applications.

  • How to use session tracking ...

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