9.6 PROGRAMMING MODELS
How do web services manifest? In practice, it is a style of writing an application. Most of it is programming the normal way of defining classes and methods. Using web services concepts, an application can be written in such a way that it performs a set of functions and also manifests or exposes itself, in some ways, to be called by other applications/programs. It is left to the business stakeholder or the designer to identify what functions need to be manifested to the outside world and how. There are instances where an application exists wholly to provide specialized services and all they do is expose their services.
An application can also be built using web services that are exposed from another application.
A service ...
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