# \#ifc4x3 **URL:** https://forums.buildingsmart.org/tag/ifc4x3/115.md [Latest](https://forums.buildingsmart.org/latest.md) · [Categories](https://forums.buildingsmart.org/categories.md) · [Tags](https://forums.buildingsmart.org/tags.md) --- ## [IFC4.3-IFC4.4 Review Technical Expert Council (TER) of buildingSMART Germany](https://forums.buildingsmart.org/t/ifc4-3-ifc4-4-review-technical-expert-council-ter-of-buildingsmart-germany/6645)
**Author:** [@mirbek.bekboliev](https://forums.buildingsmart.org/u/mirbek.bekboliev)\ **Replies:** 0\ **Last updated:** [November 6, 2026, 2:12pm UTC](https://forums.buildingsmart.org/t/ifc4-3-ifc4-4-review-technical-expert-council-ter-of-buildingsmart-germany/6645 "2026-11-06T14:12:07Z")
An official Review and comments/recommendations of bSD TER --- ## [IfcCurtainWall](https://forums.buildingsmart.org/t/ifccurtainwall/6609)
**Author:** [@pandyapalak](https://forums.buildingsmart.org/u/pandyapalak)\ **Replies:** 1\ **Last updated:** [October 16, 2026, 6:55pm UTC](https://forums.buildingsmart.org/t/ifccurtainwall/6609 "2026-10-16T18:55:45Z")
Hello Everyone, I have a question regarding the IfcCurtainWall. According to the IFC defenition of the Curtain wall. It is an element, which is hung from the edge of the slab and not on the slab. Then, how will you defi… --- ## [Dealing with Culvert Bridge Designs](https://forums.buildingsmart.org/t/dealing-with-culvert-bridge-designs/6078)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 8\ **Last updated:** [April 21, 2026, 3:33pm UTC](https://forums.buildingsmart.org/t/dealing-with-culvert-bridge-designs/6078 "2026-04-21T15:33:54Z")
Question for the infrastructure folks… In the US, we’re refining our IFC data exchange standards for bridges. At this point, we’re getting into bridge/structure configurations we didn’t originally cover in our initial D… --- ## [Correct Use of IFC Name and Reference (deprecated?)](https://forums.buildingsmart.org/t/correct-use-of-ifc-name-and-reference-deprecated/6429)
**Author:** [@victorgm](https://forums.buildingsmart.org/u/victorgm)\ **Replies:** 8\ **Last updated:** [March 11, 2026, 1:57pm UTC](https://forums.buildingsmart.org/t/correct-use-of-ifc-name-and-reference-deprecated/6429 "2026-03-11T13:57:07Z")
Hello everyone, we are currently refining our office IFC workflow (based on Allplan 2025), and several questions came up regarding the correct use of Name, Reference and Predefined Type. From our understanding, Name is… --- ## [Actor Assignment - clarifications on specification and usage](https://forums.buildingsmart.org/t/actor-assignment-clarifications-on-specification-and-usage/6305)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 1\ **Last updated:** [January 7, 2026, 7:15pm UTC](https://forums.buildingsmart.org/t/actor-assignment-clarifications-on-specification-and-usage/6305 "2026-01-07T19:15:31Z")
Can we get some clarification on the specification and usage of IfcActor, including IfcPerson, IfcOrganization, and IfcPersonAndOrganization? Our previous assumptions and efforts were all smashed by previous consultation… --- ## [About interchange in a road](https://forums.buildingsmart.org/t/about-interchange-in-a-road/6369)
**Author:** [@zfgis](https://forums.buildingsmart.org/u/zfgis)\ **Replies:** 0\ **Last updated:** [December 24, 2025, 12:56am UTC](https://forums.buildingsmart.org/t/about-interchange-in-a-road/6369 "2025-12-24T00:56:17Z")
Hello,everyone. In IFC verson 4.3,how do we express many interchanges in the road? A interchange may include many ramps. A ramp may include many bridges and many roadsegments. Thank you! --- ## [ifc 4x3 Geolocation formatting correct ?](https://forums.buildingsmart.org/t/ifc-4x3-geolocation-formatting-correct/6331)
**Author:** [@dalvarez](https://forums.buildingsmart.org/u/dalvarez)\ **Replies:** 1\ **Last updated:** [November 13, 2025, 9:23am UTC](https://forums.buildingsmart.org/t/ifc-4x3-geolocation-formatting-correct/6331 "2025-11-13T09:23:46Z")
Hello, I received a IFC 4x3 with a geolocation information, that I have never seeing and want to confirm if this is “correct\\allow” by the standards, as reading the documentation I am confused and not sure if is valid. … --- ## [Qto\_\*\*\* properties expectations](https://forums.buildingsmart.org/t/qto-properties-expectations/6298)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 7\ **Last updated:** [October 13, 2025, 11:28am UTC](https://forums.buildingsmart.org/t/qto-properties-expectations/6298 "2025-10-13T11:28:36Z")
As we further revise the US Bridge Design-to-Construction exchange standard, a question popped up about how the schema-defined Qto\_\* properties are expected to be used. I’ve looked at the documentation and past topic he… --- ## [🌍 Translations added to the IFC4.3 dev server](https://forums.buildingsmart.org/t/translations-added-to-the-ifc4-3-dev-server/6299)
**Author:** [@aothms](https://forums.buildingsmart.org/u/aothms)\ **Replies:** 0\ **Last updated:** [October 7, 2025, 3:34pm UTC](https://forums.buildingsmart.org/t/translations-added-to-the-ifc4-3-dev-server/6299 "2025-10-07T15:34:57Z")
Happy to inform you that the great work from Geert Hesselink to integrate the translations into the IFC4.3 live development platform is now live. See below in the inline image where, based on the dropdown box where end-u… --- ## [Usage of IfcFacilityPartCommon](https://forums.buildingsmart.org/t/usage-of-ifcfacilitypartcommon/6100)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 12\ **Last updated:** [August 21, 2025, 5:20pm UTC](https://forums.buildingsmart.org/t/usage-of-ifcfacilitypartcommon/6100 "2025-08-21T17:20:30Z")
In the US, we’ve proposed the following update to hierarchical structure for bridges: I am trying to confirm that this is permissible under the schema and the AbV. The question is whether this is an acceptable use of… --- ## [IFC class for earthing rod](https://forums.buildingsmart.org/t/ifc-class-for-earthing-rod/5632)
**Author:** [@namio.sousa](https://forums.buildingsmart.org/u/namio.sousa)\ **Replies:** 4\ **Last updated:** [June 26, 2025, 7:55am UTC](https://forums.buildingsmart.org/t/ifc-class-for-earthing-rod/5632 "2025-06-26T07:55:55Z")
Is there any IFC class to classify an earthing rod? --- ## [Official Model View Definitions for IFC 4.3](https://forums.buildingsmart.org/t/official-model-view-definitions-for-ifc-4-3/5737)
**Author:** [@schilu](https://forums.buildingsmart.org/u/schilu)\ **Replies:** 6\ **Last updated:** [June 2, 2025, 6:01am UTC](https://forums.buildingsmart.org/t/official-model-view-definitions-for-ifc-4-3/5737 "2025-06-02T06:01:17Z")
Hi, Where can I find the definitions of the official Model View Definitions (Reference View, Alignment Based Reference View, Design Transfer View) for IFC 4.3? There is no direct link in the IFC documentation. Also, th… --- ## [Reinforced Concrete in IFC4.3.2.0 AbV](https://forums.buildingsmart.org/t/reinforced-concrete-in-ifc4-3-2-0-abv/6095)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 2\ **Last updated:** [May 8, 2025, 7:01am UTC](https://forums.buildingsmart.org/t/reinforced-concrete-in-ifc4-3-2-0-abv/6095 "2025-05-08T07:01:50Z")
Don’t we have a consensus and definition (within the AbV and RV) of how steel reinforcing for concrete relates to the concrete elements it is reinforcing? Which IfcRel is to be used? Is the reinforcing meant to aggregate… --- ## [Where are the Signal Assembly examples cited in the IFC4x3 documentation?](https://forums.buildingsmart.org/t/where-are-the-signal-assembly-examples-cited-in-the-ifc4x3-documentation/6001)
**Author:** [@Rick\_Brice](https://forums.buildingsmart.org/u/Rick_Brice)\ **Replies:** 0\ **Last updated:** [March 8, 2025, 11:11pm UTC](https://forums.buildingsmart.org/t/where-are-the-signal-assembly-examples-cited-in-the-ifc4x3-documentation/6001 "2025-03-08T23:11:05Z")
The documentation for both IfcSign and IfcSignal direct the reader to “see Signal Assembly for examples.” Where are the signal assembly examples? The documentation does not have links for the examples, nor are the liste… --- ## [IFC4.3.2.0 Chapter 4 documentation error? - 4.1.2.4 Documentation Association](https://forums.buildingsmart.org/t/ifc4-3-2-0-chapter-4-documentation-error-4-1-2-4-documentation-association/5955)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 0\ **Last updated:** [February 20, 2025, 3:54pm UTC](https://forums.buildingsmart.org/t/ifc4-3-2-0-chapter-4-documentation-error-4-1-2-4-documentation-association/5955 "2025-02-20T15:54:22Z")
Currently, “4 Fundamental concepts and assumptions” does NOT indicate that “4.1.2.4 Document Association” is within scope of either base MVD, BUT the individual entries for IfcDocumentReference and IfcDocumentInformation… --- ## [Status of IfcPileConstruction](https://forums.buildingsmart.org/t/status-of-ifcpileconstruction/5911)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 15\ **Last updated:** [February 12, 2025, 9:14am UTC](https://forums.buildingsmart.org/t/status-of-ifcpileconstruction/5911 "2025-02-12T09:14:54Z")
In the current online specification for IfcPile, IfcPile.ConstructionType is “informally” listed as deprecated, but IfcPileConstructionEnum itself is NOT indicated as deprecated. Is this an error either way? While the … --- ## [Exporting bridge elements to IFC 4.3: IfcBridge or IfcRoad?](https://forums.buildingsmart.org/t/exporting-bridge-elements-to-ifc-4-3-ifcbridge-or-ifcroad/5811)
**Author:** [@dmkorchemnyi](https://forums.buildingsmart.org/u/dmkorchemnyi)\ **Replies:** 2\ **Last updated:** [December 19, 2024, 11:21pm UTC](https://forums.buildingsmart.org/t/exporting-bridge-elements-to-ifc-4-3-ifcbridge-or-ifcroad/5811 "2024-12-19T23:21:31Z")
Dear Colleagues, I’m currently working on exporting a bridge model to IFC 4.3 and need some guidance regarding the placement of elements on the bridge deck. There seem to be two ways to do this, and I’m not sure which o… --- ## [IfcConstructionProductResource limitation use case in Cost Norms/ Resource Built-up](https://forums.buildingsmart.org/t/ifcconstructionproductresource-limitation-use-case-in-cost-norms-resource-built-up/5754)
**Author:** [@Dimitrios](https://forums.buildingsmart.org/u/Dimitrios)\ **Replies:** 0\ **Last updated:** [November 11, 2024, 10:18pm UTC](https://forums.buildingsmart.org/t/ifcconstructionproductresource-limitation-use-case-in-cost-norms-resource-built-up/5754 "2024-11-11T22:18:57Z")
I have posted a detailed issue in the Git Repo IfcConstructionProductResource limitation use case in Cost Norms/ Resource Built-up · Issue #911 · buildingSMART/IFC4.3.x-development · GitHub with respect to a recent modif… --- ## [bSDD - buildingSMART Data Dictionary and classification of IFC 4x3 Domain mapping?](https://forums.buildingsmart.org/t/bsdd-buildingsmart-data-dictionary-and-classification-of-ifc-4x3-domain-mapping/4854)
**Author:** [@elva](https://forums.buildingsmart.org/u/elva)\ **Replies:** 10\ **Last updated:** [August 14, 2024, 12:06pm UTC](https://forums.buildingsmart.org/t/bsdd-buildingsmart-data-dictionary-and-classification-of-ifc-4x3-domain-mapping/4854 "2024-08-14T12:06:08Z")
We are struggling with utilizing IFC 4.3 infrastructure domains (as well as discipline specific domains). As an example, when exporting from revit everything goes under the building domain. We are looking for a little bi… --- ## [IFC 4x3 texture can not be displayed](https://forums.buildingsmart.org/t/ifc-4x3-texture-can-not-be-displayed/5453)
**Author:** [@longt61](https://forums.buildingsmart.org/u/longt61)\ **Replies:** 0\ **Last updated:** [June 21, 2024, 10:42am UTC](https://forums.buildingsmart.org/t/ifc-4x3-texture-can-not-be-displayed/5453 "2024-06-21T10:42:11Z")
I try to create an 4x3 IFC file with texture, even though the file passes most of the validation from Building Smart, the texture can not be displayed. The only error I got is that I have incorrect decomposition of elem… --- ## [Proxy for IfcDistributionElement](https://forums.buildingsmart.org/t/proxy-for-ifcdistributionelement/5271)
**Author:** [@CamChatHel](https://forums.buildingsmart.org/u/CamChatHel)\ **Replies:** 0\ **Last updated:** [April 4, 2024, 7:51am UTC](https://forums.buildingsmart.org/t/proxy-for-ifcdistributionelement/5271 "2024-04-04T07:51:31Z")
Hello Everyone, I have a question regarding IfcDistributionElement. I need a ProxyElement, that is a subclass of IfcDistributionElement and not a subclass of IfcBuiltElement. Can I use just IfcDistributionElement for t… --- ## [Building envelopes in IFC](https://forums.buildingsmart.org/t/building-envelopes-in-ifc/5191)
**Author:** [@cmaurer](https://forums.buildingsmart.org/u/cmaurer)\ **Replies:** 3\ **Last updated:** [March 7, 2024, 12:25pm UTC](https://forums.buildingsmart.org/t/building-envelopes-in-ifc/5191 "2024-03-07T12:25:48Z")
Description of the issue Many glass panes today have spectrally selective coatings. This means that architects/planners/engineers need the transmittance and reflectance of each glass pane spectrally resolved to calculate… --- ## [Assignment of Pset\_TransportElementCommon, Pset\_SpaceCommmon correct?](https://forums.buildingsmart.org/t/assignment-of-pset-transportelementcommon-pset-spacecommmon-correct/5116)
**Author:** [@m.mueller](https://forums.buildingsmart.org/u/m.mueller)\ **Replies:** 6\ **Last updated:** [January 31, 2024, 8:08pm UTC](https://forums.buildingsmart.org/t/assignment-of-pset-transportelementcommon-pset-spacecommmon-correct/5116 "2024-01-31T20:08:56Z")
Shouldn’t this PropertySet be assigned to IfcTransportElement? Shouldn’t this PropertySet be assigned to IfcSpace? --- ## [IfcCountMeasure changes from NUMBER to INTEGER](https://forums.buildingsmart.org/t/ifccountmeasure-changes-from-number-to-integer/5050)
**Author:** [@Sebastian](https://forums.buildingsmart.org/u/Sebastian)\ **Replies:** 4\ **Last updated:** [January 30, 2024, 9:47am UTC](https://forums.buildingsmart.org/t/ifccountmeasure-changes-from-number-to-integer/5050 "2024-01-30T09:47:31Z")
According to wikipedia’s page on the express data modelling language, number is typically implemented as a double. This is also expected in view of IfcNumericMeasure often needing to be a real. In Ifc2x3 Tc1 and Ifc4 Ad… --- ## [Pset\_\* and their property renamings](https://forums.buildingsmart.org/t/pset-and-their-property-renamings/5051)
**Author:** [@Sebastian](https://forums.buildingsmart.org/u/Sebastian)\ **Replies:** 4\ **Last updated:** [December 22, 2023, 6:40pm UTC](https://forums.buildingsmart.org/t/pset-and-their-property-renamings/5051 "2023-12-22T18:40:36Z")
There are a lot of renamings for ifc-defined dynamic property sets, both in the property set names and the properties themselves. E.g. Ifc4 Add2 Tc1 : Pset\_BuildingElementProxyProvisionForVoid : Shape maps onto Ifc4x3 A… --- ## [List of changes between IFC versions?](https://forums.buildingsmart.org/t/list-of-changes-between-ifc-versions/4604)
**Author:** [@CarlosVasquez](https://forums.buildingsmart.org/u/CarlosVasquez)\ **Replies:** 3\ **Last updated:** [February 3, 2023, 7:31am UTC](https://forums.buildingsmart.org/t/list-of-changes-between-ifc-versions/4604 "2023-02-03T07:31:03Z")
Hello, Is there a list of all the changes that occurred between, for example, IFC2x3 and IFC4? Mostly interested in changes to entities/predefined types. For example, which entities have been renamed or deprecated, what… --- ## [How can I represent "Survey Points" in a BIM viewer?](https://forums.buildingsmart.org/t/how-can-i-represent-survey-points-in-a-bim-viewer/4431)
**Author:** [@Giacomo](https://forums.buildingsmart.org/u/Giacomo)\ **Replies:** 7\ **Last updated:** [October 28, 2022, 8:11pm UTC](https://forums.buildingsmart.org/t/how-can-i-represent-survey-points-in-a-bim-viewer/4431 "2022-10-28T20:11:55Z")
Hello, I’ve just started working on ifc files, the first thing I need to do is represent points in 3D space, I’m using GeometryGym. What I would like to achieve is to display the points as shown in the documentation: … --- ## [IFC 4x1 file containing alignment is not opening in Civil 3D](https://forums.buildingsmart.org/t/ifc-4x1-file-containing-alignment-is-not-opening-in-civil-3d/3830)
**Author:** [@Anis](https://forums.buildingsmart.org/u/Anis)\ **Replies:** 2\ **Last updated:** [February 14, 2022, 2:12pm UTC](https://forums.buildingsmart.org/t/ifc-4x1-file-containing-alignment-is-not-opening-in-civil-3d/3830 "2022-02-14T14:12:05Z")
Hi! I am working on a highway project in a software named ProVI v6.2. I exported an alignment from this project using the IFC 4x1 format file (.ifc file). Then I tried to import that IFC file into Civil 3D 2022. The imp… --- ## [IFC 4.3 Infra Deployment Expert Panel: Jun 23, 2021 02:00 PM CEST](https://forums.buildingsmart.org/t/ifc-4-3-infra-deployment-expert-panel-jun-23-2021-02-00-pm-cest/3709)
**Author:** [@InfraRoomAdmin](https://forums.buildingsmart.org/u/InfraRoomAdmin)\ **Replies:** 0\ **Last updated:** [June 7, 2021, 8:21am UTC](https://forums.buildingsmart.org/t/ifc-4-3-infra-deployment-expert-panel-jun-23-2021-02-00-pm-cest/3709 "2021-06-07T08:21:54Z")
IFC 4.3 Infrastructure extension for Roads, Bridges, Ports & Waterways Infra Deployment Expert Panel Jun 23, 2021 02:00 PM CEST The pioneering effort to extend IFC into the domain of Infrastructure is now nearing comp…