In particular, the class association rule (CAR), which can be used not only for concept description but also for class prediction and decision-making, has an important role in data mining.

特别是分类关联规则既能用于概念描述又能用于分类预测与决策，在数据挖掘中发挥重要作用。

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Then the decision tree and class association rules mining are used on the video attribute database to extract a decision tree classification rule set and a class association rule set respectively.

然后分别使用决策树、分类关联规则等技术对视频属性数据库进行数据挖掘，提取出决策树分类规则集和分类关联规则集；

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Since there is an association between storage system and storage class, objects will move along the designated storage system according to the rule set in migration policy.

由于存储系统和存储类之间存在关联，因此对象将根据移植策略中设置的规则移动到指定存储系统中。

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