# IFC4 property name changes

**URL:** <https://forums.buildingsmart.org/t/ifc4-property-name-changes/2539>\
**Category:** Uncategorized\
**Created:** [March 27, 2020, 6:27am UTC](https://forums.buildingsmart.org/t/ifc4-property-name-changes/2539 "2020-03-27T06:27:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![miquelronie](https://avatars.discourse-cdn.com/v4/letter/m/f05b48/32.png) [@miquelronie](https://forums.buildingsmart.org/u/miquelronie)\
**Post date:** [March 27, 2020, 6:27am UTC](https://forums.buildingsmart.org/t/ifc4-property-name-changes/2539/1 "2020-03-27T06:27:24Z")

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Hello,  
I’v noticed that some property names has change from IFC2x3 to IFC4 even their definition is the same and even the property set is the same.  
Also, I did not see in the change lock any comments about that change.  
For example:  
EnvironmenalClass has changed to ExposureClass  
ContructionType has changed to ConstructionMethod  
Anyone knows the reason for this changes, and if they are registrated in same document so I can modify easely my property mapping method from my bim autohirng tool?

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**Author:** ![Moult](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.buildingsmart.org/moult/32/196_2.png) [@Moult](https://forums.buildingsmart.org/u/Moult)\
**Post date:** [March 27, 2020, 10:45pm UTC](https://forums.buildingsmart.org/t/ifc4-property-name-changes/2539/2 "2020-03-27T22:45:58Z")

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I think, if buildingSMART moved to using version control to manage the schema, that this will no longer be a problem.

In a pinch, you could take the computer interpretable Psets from both IFC2X3 and IFC4 and diff them.