.

 <p>
 Classes that implement the Jakarta Expression Language expression language expose their functionality via this
 abstract class. An implementation supports the following functionalities.

 <ul>
   <li>Parses a <code>String</code> into a <a href="ValueExpression.html" title="class in jakarta.el"><code>ValueExpression</code></a> or <a href="MethodExpression.html" title="class in jakarta.el"><code>MethodExpression</code></a> instance for later
   evaluation.</li>
   <li>Implements an <code>ELResolver</