A string representation of the state of the membership condition 成员条件状态的字符串表示形式。
2.
A string representation of the state of the current membership condition 当前成员条件状态的字符串表示形式。
3.
The rule - object check it ' s condition state when the event is monitored . it execute related operation if condition is true . ccrm ( conceptual cluster role mechnism ) based on cluster and role permit that same structure or heterogeneous objects integrate into cluster dynamicly and act different roles in the cluster 基于eeca ( event - condition - action )主动规则对象的行为可以按规则状态转换方式进行描述，当对象监控的事件发生时，规则对象检查它的条件状态，若条件为真，则执行有关的操作；基于簇和角色的概念聚类机制ccrm ( conceptualcluster - rolemechanism )允许同质的或异质的对象被动态聚集到簇中，在簇中扮演不同的角色。
