public StartEventHandler(Guid token, Expiration expiration, FilterMatchAction action, FilterExpression expression)
 {
     Token       = token;
     Expiration  = expiration;
     EventFilter = new EventFilter(expression, action);
 }
 public EventFilter(FilterExpression expression, FilterMatchAction action)
 {
     FilterExpression  = expression;
     FilterMatchAction = action;
 }