em to implement <code>equals()</code> and 
<code>hashCode()</code>. Moreover, each method on these expression classes 
that actually evaluates an expression receives a parameter
of class <a href="../../jakarta/el/ELContext.html" title="class in jakarta.el"><code>ELContext</code></a>,
which provides the context required to evaluate the expression.</p>

<h3><a name="ExpressionCreation">Creation of Expressions</a></h3>

<p>An expression is created through the <a href="../../jakarta/el/ExpressionFactory.html" t