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STEP是ISO提出的产品数据表达与交换的标准，在STEPPart42中对标准中的几何模式进行了定义．本文分析了Part42中的几何模式实体，并对几何模式实体的实现进行了一些探讨。
STEP is the standard of product data expression and exchange proposed by ISO, and the geometric model in the standard is defined in STEPPart42. This paper analyzes the geometric pattern entities in Part42, and discusses some implementations of geometric pattern entities.