guage variable. The expression is parsed,
 but not evaluated, and the parsed expression is mapped to the Jakarta Expression Language variable in the local
 variable map. Any previously assigned expression to the same variable will be replaced. If the expression is
 <code>null</code>, the variable will be removed.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>var</code> - The name of the variable.</dd>
<dd><code>expression</code> - The Jakarta Expression Language expression to be 