Studying the quality problem of topological spatial relationship working out the quality check on the vector data about repeated entity intersect line swing line topological region the length of line and so on .

分析研究了矢量数据空间 拓扑关系经常出现的质量问题，实现对矢量数据重复 线、交叉线、悬挂线、拓扑面、线长度等问题质量检查。

Mechanism of persistent naming topological entity supporting collaborative CAD

支持协同CAD的 拓扑 实体永久命名机制

Secondly the expression between topological entity and feature face was established and topological entity expressed by feature face was referred to during the course of feature 's parametric definition and as a result the problem of persistent naming topological entity for feature-based collaborative CAD was solved .

建立 拓扑 实体与特征面之间的表达关系，在特征参数化定义过程中引用由特征面表达的拓扑面，解决基于特征的协同CAD中拓扑实体永久命名问题；

Direct referring to topological entity of B-Rep domain in feature 's parametric definition domain is inherent limitation of previous persistent naming topological entity method .

在特征参数化定义域直接引用B-Rep域中的 拓扑 实体是以往永久命名方法固有的缺陷。

The realtime datum spatial topological datum datum of facility property and the function of operating the datum are enveloped in class of spatial entity and then set up object of spatial entity .

将实时数据、空间 拓扑数据、设备属性数据以及对这些数据操作的函数封装为空间 实体类，建立了空间实体对象。