* This class represents a port range as specified in the <code>dnsName</code> and <code>ipAddress</code> datatypes. The range may have upper and lower bounds,
* be specified by a single port number, or may be unbound.
* you are required to call {@link #close()} when you no longer need an instance - especially before replacing with a new instance (with different modules) - in
* order to make sure these resources are released properly by each underlying module (e.g. close the attribute caches).
* An {@link EvaluationContext} associated to an XACML Individual Decision Request, i.e. for evaluation to a single authorization decision Result (see Multiple
* Decision Profile spec for more information on Individual Decision Request as opposed to Multiple Decision Request).