A URL pattern is a URL with special addtions that maps to one or
more resources. URL patterns are a convenient way to map security
constraints to a collection of web resources. When a URL pattern is
used to subject security constraints on a collection of resources, any
resource request that matches that URL pattern is subject to the
security constraint. For example, if you
define the URL pattern to be /salesinfo/*, all resources contained
in salesinfo will be subject to the security constraint.