[Identifier] event [Comment] For example, asset may be used at the “FIFA World Cup” only. To express events related to undertaking Duties, a specific event value has been defined: policyUsage – the time period whilst the policy is being exercised This will enable constraints to be expressed such as “event lt o:policyUsage” indicating before the policy is exercised. [Semantics] 
Specification of a defined event applicable to the asset usage