To be specific, when reading Wallace on appositional vs epexegetical throughout his book:
- He talks about both as separate categories throughout his grammar for numerous applications of the language: Nominatives, datives, accusatives, infinitives, and with ὁτι or ἱνα (see Wallace 48, 62, 70f, 152; 198, 458f, 460, 475f, 600, 606f).
- Yet, only for the genitive case, does he combine the two together and call them: “Genitive of Apposition (Epexegetical Genitive, Genitive of Definition).”
- Appositional (namely, that is to say—defining or clarifying the previous statement); or
- Epexegetical (to the effect that—explaining, clarifying, or completing the previous statement.)
p. 460 he notes about the infinitive that: “Many examples... could be treated either as appositional or epexegetical (although the appositional use is more common than epexegetical).”
Gary D. Collier