CV-2x3-136 (aka CV-06-136)
Agreement on exporting the construction type
Based on IFC2x3
Initiator ISG Meeting-Waltham
Effects Extended Coordination View
Date 2007 03 13
The construction type is an essential information for many downstream applications, e.g. for quantity take-off, energy calculation, etc. It identify the category or classification of an element type. E.g. all single layer hollow masonary walls with thickness 240mm may have the construction type "HLZ 240".
If such an information is available within the sending application, it should be exported in a consistent way. The agreement is:
* for application handling occurrence objects only (in general. or for certain building elements) it should be exported as property "Reference" being part of the common property set, e.g. Pset_WallCommon.Reference
* for application handling type objects (at least for some building elements) it should be exported as Name attribute of the type object, e.g. IfcWallType.Name
If both information is present, the construction type assigned to the occurrence shall override the construction type assigned to the type.