According to the concept of context process problem space,. the concept of Directed Assembly Relationship Graph(DARG) was put forward. The isomorph of DARG was defined.

• 根据上下文工艺问题空间的概念,提出了有向装配关系图的概念,定义了有向装配关系图同构,以有向装配关系图和零件通用属性来构建实例库。