Definition
A30: “pragmatic equivalence between translations may need to preserve not just distributions of final judgments but the dynamics of interpretation”, a “commuting diagram for pragmatic fidelity”: T_τ(f) Φ ≈ Φ T_f, where Φ maps source interpretive states to target ones. “interpretive operations may fail to commute with each other, while a good translation should preserve the structure of those operations across contexts.”
What it is not
Not a replacement for TERM-021: A30 calls it “a considerably richer notion of fidelity”, a further requirement. It uses the operator sense of frame (TERM-026).