The API_IFC...
structures describe the IFC data connected to elements. These structures can be used to get these data and also modify them.
Structures
API_IFCPropertyAPI_IFCPropertyHeadAPI_IFCAttribute
API_IFCPropertyValueAPI_IFCPropertyAnyValueAPI_IFCPropertySingleValue
API_IFCPropertyBoundedValue
API_IFCPropertyListValue
API_IFCPropertyEnumeratedValue
API_IFCPropertyTableValue
API_IFCClassificationReferenceAPI_IFCClassification