实体定义
属性定义
序号属性名称中文解释数据类型必填
GfcRoot
GfcRelationShip
1NameGfcLabel
GfcRelConnects
继承关系
GfcRoot
  └GfcRelationShip
    └GfcRelConnects
      ├GfcRelCoversBldgElements
      └GfcRelConnectsElements