Many web applications require the same sequence of steps to execute in different contexts.
Often these sequences are merely components of a larger task the user is trying to accomplish.
Such a reusable sequence is called a flow.
Consider a typical shopping cart application.User registration,login,and cart checkout are all
examples of flows that can beinvoked from several places in this type of application.
Spring Web Flow is the module of Spring for implementing flows.The Web Flow engine plugs
into the Spring Web MVC platform and provides declarative flow definition language.
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