Docs for register element list the name child element as registerNameType but does not define what that type is. No such type is found in the published Schema either. Schema indicates the type is supposed to be dimableIdentifierType, but the schma as an "authoritative" doc is highly questionable as the tooling such a SDVConv don't use it to validate input. So the real spec ends up as "whatever SDVConv accepts". That's a problematic, though fixable, condition.