UMLR — ConnectableElement is not defined until section 11, but Parameter (defined in section 9) inherits ConnectableElement and needs to see its definition

Parameter is defined in section 9. However, the two generalizations of ConnectableElement, which is an abstract class, are already defined in section 7 (TypedElement and ParameterableElement). In order to define ConnectableElement, for example in C++, it is sufficient to provide forward declarations of the types ConnectorEnd and ConnectableElementTemplateParameter. Therefore, ConnectableElement could be defined in section 9 as well so that Parameter's definition need not be deferred until ConnectableElement has been defined. Otherwise, it is not possible to define Parameter until much later.

Although nothing else in the metamodel seems to specialize Parameter, Parameter figures prominently in all of the related diagrams, so it should probably remain in section 9 where it currently resides. Would it make sense to move ConnectableElement's definition up to section 9?