xposes objects
of type <code>java.beans.FeatureDescriptor</code>, providing all information of interest 
on top-level model objects as well as their properties.</p> 

<h3><a name="Functions">Jakarta Expression Language Functions</a></h3>

<p>If a Jakarta Expression Language expression uses a function 
(for example <code>${fn:toUpperCase(customer.name)}</code>), then a 
<a href="../../jakarta/el/FunctionMapper.html" title="class in jakarta.el"><code>FunctionMapper</code></a> object must also be specified wit