IfcWorkCalendarTypeEnum是枚举数据类型，指定可以从中选择相关控件的工作日历类型。如果给它应该有助于识别基准日历。
Enumeration definition
| Constant | Description |
|---|---|
| FIRSTSHIFT | Belongs to the first shift. |
| SECONDSHIFT | Belongs to the second shift. |
| THIRDSHIFT | Belongs to the third shift. |
| USERDEFINED | |
| NOTDEFINED |