Generalizing empirical adequacy II: partial structures

I show that extant attempts to capture and generalize empirical adequacy in terms of partial structures fail. Indeed, the motivations for the generalizations in the partial structures approach are better met by the generalizations via approximation sets developed in "Generalizing Empirical Adequacy I" (Lutz in Synthese 191:3195-3225, 2014b. https://doi.org/10.1007/s11229-014-0440-3). Approximation sets also generalize partial structures.