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.

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