A PolicyGroup is a collection of rules used to define a related set of PolicyRules or other PolicyGroups. The PolicyRule entity acts as the heart of the Policy model and is shown in Figure RA.05. The rule is triggered by an event and comprised of one or more PolicyConditions and one or more PolicyActions. If a PolicyCondition(s) is met then one or more PolicyActions result. The PolicyRule is characterized further by a PolicyRuleSpec.<br/>