By carefully organizing candidate item set, it can get good efficiency.

通过合理地组织候选项索引，可以取得较高的效率。

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Matching objects in the item set based on downward closure lemma and spatiotemporal topology: we match the objects in order to create the spatiotemporal association candidate set;

基于向下闭合引理，对时空频繁状态表中的对象进行时空拓扑匹配，得到时空关联规则候选集；

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Its characteristic is that the candidate set is adopted by the key word identifies, and at the same time transaction data is compressed by transaction and item.

该算法的特点是：项目集采用关键字识别，同时对事务数据进行事务和项目压缩。

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