ifcos-syntax-elements

To extract property sets from IFC elements, traverse the IsDefinedBy relationship to IfcRelDefinesByProperties, access IfcPropertySet, and read HasProperties while guarding against None values in NominalValue. Prefer ifcopenshell.util.element.get_psets() for reliable property extraction.

Querying IFC elements by GlobalId or STEP ID requires using the schema-agnostic by_guid and by_id lookup methods. These methods provide correct entity retrieval from the IFC model while avoiding persistence warnings associated with direct attribute access.

Traversing inverse relationships in IFC models requires using the get_inverse method to safely find referencing entities. To maintain performance in production workflows, avoid recursive get_info expansion inside loops and use efficient attribute reading patterns instead.

IfcOpenShell code returns None when reading IFC property values if the wrapped NominalValue is not properly guarded during extraction. Implement guardrails against None values when traversing IfcRelDefinesByProperties to ensure robust property set data retrieval.

You can list all elements of a specific IFC class like IfcWall by using the schema-agnostic by_type method. This approach correctly retrieves all entities matching the specified IFC class from the model without bypassing structural relationships.