Definitions for "Pronominal"
Belonging to, or partaking of the nature of, a pronoun.
relating to pronouns; "pronominal reference"
Mine is considered as a [+Gen] Pronominal (and not a Determiner) since it serves as a pronoun/DP--e.g., this is mine (= my book vs. * Mine boo k). The [+Gen] Determiner My, on the other hand, is Prenominal since it introduces (comes before) a Noun ( my book).