IFC Syntax : Property Sets

An IFC element carries its non-geometric data in property sets. A property set is a named container of properties ; an objectified relationship binds that container to one or more objects. This skill covers the container, the relationship, the property value entities, and the rules that keep them valid.

Applies to IFC2x3, IFC4, and IFC4.3. Three items changed across versions : see the Version Differences section.

Quick Reference

The container plus relationship pattern

A property set is NEVER a child of the element. It floats in the file as its own instance and is linked by an IfcRel* relationship. ALWAYS hold this pattern in mind : one container entity, one objectified relationship.