Halliday & Matthiessen (2014: 287):
The continuity becomes clearer when we set up as Value/Identifier something that is explicitly worded as membership of a class, using the expression ‘one of ...’
Pat is one of the richest people I know
Identified/Token Identifier/Value
Blogger Comment:
Note that, viewed 'from above', an attributive relation obtains between the Head (Carrier) — one — and the Postmodifier (Attribute) — the richest people I know — of the nominal group serving as Identifier/Value.