code: @Override
  	public EClass getIfcMaterialConstituent() {
  		if (ifcMaterialConstituentEClass == null) {
  			ifcMaterialConstituentEClass = (EClass) EPackage.Registry.INSTANCE.getEPackage(Ifc4Package.eNS_URI)
  					.getEClassifiers().get(358);
  		}
  		return ifcMaterialConstituentEClass;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated