 One of the best known responses to the possibilist challenge was developed by Alvin Plantinga (1974, 1976). Plantinga’s response (more or less as fleshed out formally by Jager (1982)) requires no significant modifications to KQML beyond explicitly adopting the  serious actualism  condition discussed at the end of  §4.1.1.[64]  Rather, his response has almost entirely to do with the metaphysics of intended interpretations, or what he calls applied semantics. More specifically, he claims to provide an actualistically acceptable ontology for constructing intended interpretations for applied languages.