The challenge in working bottom up is that it may be hard to map Strategic and Tactical requirements that were defined before the rule mining unless there is additional metadata and context available.

从下到上的方法的难点在于可能在规则挖掘之前会很难确定战略战术需求，除非有额外可用的元数据和上下文。

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This article also probes into some theories and methods of automatic extraction of information from metadata by using template mining.

并探讨了在元数据中利用模板自动抽取信息的一些原理及方法。

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