Other Element IFC2x3 / IFC4

IfcAnnotation

What is IfcAnnotation?

IfcAnnotation represents non-physical markup elements used for documentation purposes, such as dimension lines, text labels, symbols, hatching, and survey points. Annotations do not represent real building components — they provide supplementary information for reading and interpreting the model.

Real-World Usage

Annotations are primarily used in 2D drawing generation from BIM models. While they appear in IFC files exported with drawing views, they are typically filtered out when working with 3D model data in viewers and analysis tools.

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Related Entity Types

Other Element

IfcBuildingElementProxy

IfcBuildingElementProxy is a generic placeholder for building elements that do not fit any specific IFC entity type. It is commonly used for custom or non-standard elements, complex assemblies, or elements from authoring tools that lack a precise IFC mapping. The proxy ensures geometry is preserved even when semantic classification is unclear.