Full Idea
A sentence is said to be true when the historic state of affairs to which it is correlated by the demonstrative conventions (the one to which it 'refers') is of a type with which the sentence used in making it is correlated by the descriptive conventions.
Gist of Idea
True sentences says the appropriate descriptive thing on the appropriate demonstrative occasion
Source
J.L. Austin (Truth [1950], §3)
Book Reference
'The Nature of Truth', ed/tr. Lynch, Michael P. [MIT 2001], p.28
A Reaction
This is correspondence by convention rather than correspondence by mapping. Personally I prefer some sort of mapping account, despite all the difficulty and vagueness of specifying what maps onto what.