BIM token primitives
Eight categories anchored to the IFC 4.3 entity hierarchy plus the Uniclass 2015 classification floor. Each category publishes typed DTCG tokens that downstream BIM authoring tools, validation runners, and AI agents consume directly.
Spatial
› IfcSpatialElement
5 tokens
Elements
› IfcBuiltElement
10 tokens
Systems
› IfcDistributionElement
5 tokens
Materials
› IfcMaterial
7 tokens
Assemblies
› IfcElementAssembly
3 tokens
Performance
› IfcPropertySet
7 tokens
Identity + Codes
› IfcClassificationReference
6 tokens
Relationships
› IfcRel*
8 tokens
Why eight primitives
The eight categories were validated against IFC 4.3 entity hierarchy by sub-agent A research, 2026-04-28. The taxonomy is not arbitrary — every category anchors on a specific IFC entity backbone, so a token in one category can be cross-referenced to its IFC kin without ambiguity. The token taxonomy research documents the cross-walk.
Uniclass 2015 plays the role here that the Carbon-baseline floor plays in
design.pointsav.com's META-substrate — the classification floor every
element receives by default, with deployment-specific classifications (OmniClass,
MasterFormat, jurisdiction-specific) layering on top.