Full Idea
In possible worlds logics a statement is true-in-a-world rather than just true.
Gist of Idea
Possible worlds logics use true-in-a-world rather than true
Source
Rod Girle (Modal Logics and Philosophy [2000], 1.1)
Book Reference
Girle,Rod: 'Modal Logics and Philosophy' [Acumen 2000], p.2
A Reaction
This sounds relativist, but I don't think it is. It is the facts which change, not the concept of truth. So 'donkeys can talk' may be true in a world, but not in the actual one.