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
GfcRepresentationItem
GfcRepItemGroup
1TransformGfcMatrix
2ItemsLIST [0:?] OF GfcRepresentationItem
继承关系
GfcRoot
  └GfcRepresentationItem
    └GfcRepItemGroup