实体定义
继承关系
GfcRoot
├GfcGeometry
├GfcInternalChart
├GfcInternalPt
├GfcNurbsCtrlPt2d
├GfcNurbsCtrlPt3d
├GfcPlaneCoef
├GfcPlaneInfo
├GfcRepresentation
├GfcRepresentationItem
├GfcColor
├GfcIndexedColourMap
├GfcIndexedTextureMap
├GfcSurfaceTexture
├GfcRefString
├GfcAppearanceMaterial
├GfcTextureCoordList
├GfcElementShape
├GfcObject
├GfcProperty
├GfcPropertySet
├GfcRelationShip
├GfcSection
├GfcShape
├GfcConnectionGeometry
├GfcBillDetail
├GfcBillTotal
├GfcQuotaDetail
├GfcQuotaTotal
├GfcSteelDetail
└GfcSteelTotal