最邻近法则（1-NN）是最简单和最为自然的分类法则。

The 1-Nearest-Neighbor Rule (1-NN) is the simplest and most natural classification rule.

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例如，“数据词典”和“数据模型”与元数据相关；而词汇表、控制词汇和分类法则与数据实例相关。

For example, "data dictionary" and "data model" are related to the metadata; whereas glossary, controlled vocabulary and taxonomy concern the data instances.

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为了解决这个问题，给出了直接分类模式、树分类模式、分类法则和科目约束表达式等概念和形式化定义。

To solve the problem, the concepts and formal definitions including direct classification schema, tree classification schema, classification rule, and family constraining expression were presented.

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