D.2.1.21 IfcBuildingSystem

IfcBuildingSystemIfcBuildingSystemIfcGloballyUniqueIdIfcOwnerHistoryIfcPersonAndOrganizationIfcPersonIfcIdentifierIfcLabelIfcLabelIfcLabelIfcLabelIfcLabelIfcActorRoleIfcTelecomAddressIfcAddressTypeEnumIfcTextIfcLabelIfcLabelIfcLabelIfcLabelIfcURIReferenceIfcURIReferenceIfcOrganizationIfcIdentifierIfcLabelIfcTextIfcActorRoleIfcAddressIfcActorRoleIfcRoleEnumIfcLabelIfcTextIfcApplicationIfcStateEnumIfcChangeActionEnumIfcTimeStampIfcPersonAndOrganizationIfcApplicationIfcTimeStampIfcRelAggregatesIfcObjectIfcRelAggregatesIfcObjectIfcLabelIfcRelDefinesByPropertiesIfcPropertySetIfcPropertySingleValueIfcPropertyBoundedValueIfcPropertyEnumeratedValueIfcRelAssignsToGroupIfcProduct