code: public EClass getIfcQuantityVolume() {
  		if (ifcQuantityVolumeEClass == null) {
  			ifcQuantityVolumeEClass = (EClass) EPackage.Registry.INSTANCE.getEPackage(Ifc2x3tc1Package.eNS_URI)
  					.getEClassifiers().get(417);
  		}
  		return ifcQuantityVolumeEClass;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated