| Host | H | IfcSite or IfcFacility as host, Optional if connected to IFC Project as Root | Geometry |
| GlobalId | G | Optional Global identifier (GUID) formated to IFC string syntax. Automatic assignment if empty | Text |
| Name | N | Building Name | Text |
| Desc | D | Optional Building Description | Text |
| ObjectType | T | Optional Object Type Description | Text |
| Representation | R | Optional IfcShapeRepresentation | Geometry |
| LongName | L | Long Name | Text |
| Composition | C | Composition(0=NOTDEFINED 1=COMPLEX 2=ELEMENT 3=PARTIAL) | Integer |
| PredefinedType | P | PredefinedType (0=NOTDEFINED 1=USERDEFINED 2=SEGMENT 3=ABOVEGROUND 4=JUNCTION 5=LEVELCROSSING 6=BELOWGROUND 7=SUBSTRUCTURE 8=TERMINAL 9=SUPERSTRUCTURE) | Integer |
| Usage | U | Usage (0=NOTDEFINED 1=USERDEFINED 2=LATERAL 3=REGION 4=VERTICAL 5=LONGITUDINAL) | Integer |