IfcDirectionSenseEnum是一个枚举，表示沿给定轴方向感是正的还是负的。
IFC2x中的历史新类型。
Enumeration definition
| Constant | Description |
|---|---|
| POSITIVE | Direction defined to be positive. |
| NEGATIVE | Direction defined to be negative. |
EXPRESS Specification
TYPE IfcDirectionSenseEnum = ENUMERATION OF (
POSITIVE,
NEGATIVE);
END_TYPE;