in
              of operations and not the full expression tree.
            </p></td></tr>
</table></div>
</li>
<li class="listitem">
<p class="simpara">
            Once the full expression chain is built, it is evaluated as a chain of
            sub-expressions from left-to-right, exactly as the composition rule above.
            The evaluated elements are the ones of the expression itself. The expression
          </p>
<pre class="programlisting"><span class="identifier">a</span> <span class="identifi