# Guidelines for Ifc4x3 (add2) exports to Ifc2x3 (tc1) and Ifc4 (add2 tc1)?

**URL:** <https://forums.buildingsmart.org/t/guidelines-for-ifc4x3-add2-exports-to-ifc2x3-tc1-and-ifc4-add2-tc1/5133>\
**Category:** Developers\
**Created:** [January 23, 2024, 9:02am UTC](https://forums.buildingsmart.org/t/guidelines-for-ifc4x3-add2-exports-to-ifc2x3-tc1-and-ifc4-add2-tc1/5133 "2024-01-23T09:02:40Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sebastian](https://avatars.discourse-cdn.com/v4/letter/s/4da419/32.png) [@Sebastian](https://forums.buildingsmart.org/u/Sebastian)\
**Post date:** [January 23, 2024, 9:02am UTC](https://forums.buildingsmart.org/t/guidelines-for-ifc4x3-add2-exports-to-ifc2x3-tc1-and-ifc4-add2-tc1/5133/1 "2024-01-23T09:02:40Z")

</div>

e.g.

- IfcConveyorSegment(Type): Is it advisable to map to an IfcFlowSegment and IfcDistributionElementType pair?
- IfcBridge / IfcBridgePart : Is geometry then directly placed in an IfcSite?
- IfcTendonConduit(Type) : Is is advisable to map an IfcElementComponent(Type) to IfcBuildingElementProxy(Type)?
- IfcGeotechnicalStratum, IfcBorehole, IfcGeoslice, IfcGeomodel : Just don’t export or is there a suitable alternative?