【Key words】 Knowledge-Based Engineering； extended feature modeling； knowledge primitive feature； knowledge constraint； knowledge repository；
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knowledge constraint driven 知识驱动
knowledge level constraint 知识级约束
Knowledge constraint modeling establishes a foundation to process the knowledge primitive model.
知识约束系统建模是对知识元特征模型进行知识处理的基础。
参考来源 - 基于知识的CAD系统若干关键技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The main constraint was that the competencies included in the IEP had to reflect 7 knowledge and skills relevant to the client project to which they were assigned.
IEP中的硬指标，是其包含的待学习能力必须反映7被指派给他们的项目相关的知识和技能。
This can include both constraints in general (for instance, not knowing what makes a good constraint), as well as a lack of knowledge regarding how to implement a constraint in a model.
这包含通常的约束(举例来说，不知道什么能形成好的约束)，和缺乏了解如何在模型中实现约束。
Variable rule, constraint rule and effective rule were discussed, and construction approaches for configuration knowledge base are proposed.
给出了变量配置规则、配置约束规则和有效性规则等。 讨论了配置知识库的构建方法。
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