Note that no comparisons are performed on the Machine object's properties. 注意,这里不会对Machine对象的属性进行比较。
This reference is then used in the consequence part of the rule to assign tests to the Machine object. 然后,在规则的结果块使用该引用,将测试分配给Machine对象。
These rules'conditional elements now inspect a Machine object's tests collection to determine if it contains a specific Test instance. 这些规则的条件元素现在检查一个Machine对象的tests集合,以确定它是否包含特定的Test实例。
Whenever this element evaluates to true, it assigns a reference to the Machine object that is then used in the consequence part of the rule. 当这个元素等于true时,它将一个引用分配给Machine对象,而后者将在规则的结果块被用到。
Without this reference assignment, there would be no way to assign a tests due date to the Machine object. 如果不分配这个引用,那么就无法将测试到期日期分配给Machine对象。