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Full Idea
In rationalist views of meaning, based on the 'golden triangle', to be competent with an expression is to be in an internal cognitive state that puts one in a position to identify its extension in any possible world based only on apriori reflection.
Clarification
See Idea 14708 for the 'golden triangle'
Gist of Idea
Rationalists say knowing an expression is identifying its extension using an internal cognitive state
Source
Laura Schroeter (Two-Dimensional Semantics [2010], 2.3.1)
Book Ref
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.22
A Reaction
This looks like a proper fight-back against modern rampant externalism about meaning. All my intuitions are with internalism, which I think points to a more coherent overall philosophy. Well done, David Chalmers! Even if he is wrong.
Related Idea
Idea 14708 Rationalist 2D semantics posits necessary relations between meaning, apriority, and possibility [Chalmers, by Schroeter]