分析了STEP - NC程序构造特点，提出基于形式和实体白勺信息提取方法，并通过实例停止验证。
Research the characteristics of the STEP-NC program structure, and propose a method of information extraction based on schema and entity. In the last, test and verify the method by an example.
还存在其他方法和形式，但是本文将集中于实体关系建模技术，因为此项技术与稍后将描述的技术更密切相关。
There are other approaches and forms, but this article focuses on the entity-relationship modeling technique because it is more closely related to the technologies described later.
有些形式的规则在模型中的业务类型定义中是隐式的，它们出现在被建模领域的业务类型的UML和实体关系(ER)模型中。
Certain forms of rules are implicit in the definition of the business types in the model, and manifest in UML and entity relationship (er) models of the business types of the modeled domain.
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