RequestModule provides access to Request object properties.
To get access to request properties use XPath syntax, e.g. to get the request
context path use 'contextPath' as the attribute name.
More complex expressions are also supported, e.g.:
'userPrincipal/name'
will return the name property of the Principal object returned by the
request.getUserPrincipal() method. If requested object is not found then
an exception will be thrown.
author: Konstantin Piroumian version: $Id: RequestModule.java 433543 2006-08-22 06:22:54Z crossley $