code: public EClass getIfcShell() {
  		if (ifcShellEClass == null) {
  			ifcShellEClass = (EClass) EPackage.Registry.INSTANCE.getEPackage(Ifc2x3tc1Package.eNS_URI).getEClassifiers()
  					.get(968);
  		}
  		return ifcShellEClass;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated