buildingSMART/IFC4.x-development

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Repository to collect updates to the IFC4.x specification

Stars: 234
Forks: 123
Open beginner issues: 0
Indexed issues: 496
Avg merge: 15h 4m
Merged PRs (30d): 5

Dominant language: Python
License: No license data
Last GitHub push: Sep 9, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

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496 open issues indexed

Proposal to formalise how property set templates are applicable to external classification systems Open

allocated-core ifc-update-out

buildingSMART/IFC4.x-development#1074 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Tracking the big issues Open

ifc-update-out

buildingSMART/IFC4.x-development#1052 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Lack of randomness in pset template GlobalIds Open

allocated allocated-core ifc-update-out

buildingSMART/IFC4.x-development#23 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Inconsistent comma separated values in pset template definitions Open

allocated-core ifc-update-out

buildingSMART/IFC4.x-development#1071 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Improved documentation required for IfcShapeAspect ProductDefinitional attribute Open

allocated-core before-NWI proposal

buildingSMART/IFC4.x-development#27 · 15 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Request for standard metadata and geometry representation of concrete pours and pour breaks Open

allocated allocated-core allocated-sequence ifc-update-out

buildingSMART/IFC4.x-development#28 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Potential issue with needing more than one precision value Open

allocated allocated-core ifc-update-out

buildingSMART/IFC4.x-development#31 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to add "BALCONY" as a predefined type for IfcSlab Open

allocated-core ifc-update-out proposal

buildingSMART/IFC4.x-development#32 · 25 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Clarification required on how an IfcTask consumes IfcResources Open

allocated allocated-cost allocated-sequence ifc-update-out

buildingSMART/IFC4.x-development#48 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
References to properties and attributes in the documentation should be intelligently linked Open

allocated-www ifc-update-out proposal

buildingSMART/IFC4.x-development#49 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to change description for CardinalPoint of IfcMaterialProfileSetUsage Open

allocated-core allocated-structural ifc-update-out proposal

buildingSMART/IFC4.x-development#51 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal for IFC to better describe paints and coatings Open

allocated allocated-core ifc-update-out

buildingSMART/IFC4.x-development#52 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to add a predefined type enumeration to IfcDocumentInformation Open

allocated-core allocated-fm ifc-update-out proposal

buildingSMART/IFC4.x-development#57 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to remove IfcApprovalRelationship and replace it with IfcRelNests Open

allocated-core allocated-sequence ifc-update-out

buildingSMART/IFC4.x-development#1072 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
IfcRepresentation documentation Open

allocated-core ifc-update-out proposal

buildingSMART/IFC4.x-development#66 · 16 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal for IfcMaterial to have an inverse HasContext Open

allocated-building allocated-core ifc-update-out proposal

buildingSMART/IFC4.x-development#67 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Description required for COMMUNICATION in IfcDistributionSystemEnum Open

allocated-mepf ifc-update-out proposal

buildingSMART/IFC4.x-development#68 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to set a default LayerSetDirection on the object type level Open

allocated allocated-building allocated-core ifc-update-out

buildingSMART/IFC4.x-development#70 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to split UnitBasis attribute for IfcCostValue into UnitBasis and UnitValue Open

allocated-cost ifc-update-out proposal

buildingSMART/IFC4.x-development#71 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
IfcSIUnitName has DEGREE_CELSIUS Open

allocated-core ifc-update-out proposal

buildingSMART/IFC4.x-development#72 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
documentation issue at IfcSimplePropertyTemplate Open

after-NWI allocated-core iso-compatibility proposal

buildingSMART/IFC4.x-development#73 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to modify calculation description for IfcCostItem for schedule of rates Open

allocated-core allocated-cost ifc-update-out proposal

buildingSMART/IFC4.x-development#76 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to document the equation of a cost rate in calculating the total cost of a cost item Open

allocated allocated-cost ifc-update-out

buildingSMART/IFC4.x-development#77 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to reintroduce Productivity for IfcTaskTime and `SCHEDULEOFRATES` for work schedule predefined type Open

allocated allocated-core allocated-cost allocated-sequence ifc-update-out

buildingSMART/IFC4.x-development#78 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to introduce Qto_TaskBaseQuantities Open

allocated allocated-core allocated-cost allocated-sequence ifc-update-out

buildingSMART/IFC4.x-development#79 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to describe parametric counting in cost quantities Open

allocated-cost ifc-update-out proposal

buildingSMART/IFC4.x-development#80 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to describe how CostQuantities cannot be used for SCHEDULEOFRATES Open

allocated-cost ifc-update-out proposal

buildingSMART/IFC4.x-development#81 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to prioritise formulas in case the AppliedValue of a CostValue contradicts the Components Open

allocated allocated-cost ifc-update-out

buildingSMART/IFC4.x-development#82 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal to describe behaviour of UnitBasis on component CostValues Open

allocated allocated-cost ifc-update-out

buildingSMART/IFC4.x-development#83 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Pset_ManufacturerTypeInformation property ModelReference should be renamed to ModelNumber Open

allocated-fm ifc-update-out proposal

buildingSMART/IFC4.x-development#86 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Why does Pset_ManufacturerTypeInformation.Manufacturer double up with IfcRelAssignsToActor with role MANUFACTURER? Open

allocated allocated-core allocated-fm ifc-update-out

buildingSMART/IFC4.x-development#87 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
IfcDoor and IfcWindow : add "ClearHeight" and "ClearWidth" parameters Open

allocated-building decided ifc-update-out

buildingSMART/IFC4.x-development#88 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
IfcXML xsd Open

allocated allocated-core ifc-update-out

buildingSMART/IFC4.x-development#91 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Tracking issue migrating to non-proprietary UML-based workflows Open

allocated-core ifc-update-out

buildingSMART/IFC4.x-development#104 · 18 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Mistake in `IfcSIPrefix` documentation Open

allocated allocated-core before-NWI

buildingSMART/IFC4.x-development#106 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Create missing Predefined Types for property associations Open

allocated-core ifc-update-out proposal

buildingSMART/IFC4.x-development#108 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Annotation 2|3D concept is self contradictory Open

allocated allocated-core ifc-update-out

buildingSMART/IFC4.x-development#113 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Resource Cost concept incorrectly parametrized Open

allocated allocated-core allocated-cost ifc-update-out

buildingSMART/IFC4.x-development#114 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
IfcSpace geomset concept usage contradicts template defintion Open

allocated allocated-core ifc-update-out

buildingSMART/IFC4.x-development#115 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Quantity Sets template PredefinedType binding Open

allocated allocated-core ifc-update-out

buildingSMART/IFC4.x-development#117 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Aggregation parametrized without any definition Open

allocated allocated-core ifc-update-out

buildingSMART/IFC4.x-development#118 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Invalid parametrizations on Port Nesting template Open

allocated allocated-core ifc-update-out

buildingSMART/IFC4.x-development#121 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Reword schema intro docs Open

after-NWI allocated-core iso-Ed proposal

buildingSMART/IFC4.x-development#123 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Inconsistency "4.9.1.2.4 Type Body Tessellated Geometry" "4.8.1.4.9 Body Tessellation Geometry " Open

after-NWI allocated-core iso-Ed proposal

buildingSMART/IFC4.x-development#127 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Which tool to use to review the changes? Open

allocated-core ifc-update-out

buildingSMART/IFC4.x-development#131 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Question: should IfcBuildingElementPart also be renamed to Buil**t**Elem... Open

allocated-core ifc-update-out iso-compatibility proposal

buildingSMART/IFC4.x-development#132 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
MEP pset refinements Open

affects-uml allocated-core decided ifc-update-out ready-for-verification

buildingSMART/IFC4.x-development#138 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
duplicates for building elements within the pset_xxxcommon Open

allocated-core ifc-update-out proposal

buildingSMART/IFC4.x-development#139 · 3 comments · 0 reactions · 2 assignees · Indexed Sep 14, 2026
Underscores in predefined types Open

allocated-core ifc-update-out iso-compatibility proposal

buildingSMART/IFC4.x-development#141 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Difference between IfcDistributionPort FlowDirection Null and NOTDEFINED Open

allocated allocated-mepf ifc-update-out

buildingSMART/IFC4.x-development#144 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026

buildingSMART/IFC4.x-development

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