UMLR — TemplateParameter placeholder names?

In most programming languages which support templates, one would normally define the primary template with placeholders for the type names, e.g.: "List<K>" or "Map<Key,Value>".

However, TemplateParameter derives directly from Element; and so does ParameterableElement, as well as TemplateSignature. Since none of the above are NamedElement, where are we supposed to store the strings used for the placeholder names?

Perhaps there is a simple solution which I have overlooked. The specification could be clearer on the subject.