code: @SuppressWarnings("unchecked")
  	@Override
  	public EList<IfcExternalReferenceRelationship> getHasExternalReference() {
  		return (EList<IfcExternalReferenceRelationship>) eGet(
  				Ifc4Package.Literals.IFC_APPLIED_VALUE__HAS_EXTERNAL_REFERENCE, true);
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated