Evaluate expression in spring web flow
<p>I am new to Spring framework learning   Spring mvc and spring web flow . I came across an evaluate expression in action state </p>

<pre><code>&lt;evaluate expression = " requestParameters.ishotelbooking" result="flowScope.hotelbooking" /&gt;
</code></pre>

<p>Couldn't able to figure it out what is actually happening ?? And one more thing i understand that we are assigning flow scope for hotelbooking object but how the framework understands the hotelbooking is the object of hotel class ie how we can understand the type of object here .. can someone guide me .. Thanks in advance  </p>