possessive form of the proper noun 'Anselm', indicating something belonging to or associated with Anselm (e.g., Anselm's book).

人名「アンセルム」の所有格。（アンセルムに属するもの／アンセルムの）

contraction of 'Anselm is' (e.g., 'Anselm's very tall.' = 'Anselm is very tall.').

「Anselm is」の短縮形（＝アンセルムは…である）

contraction of 'Anselm has' used as an auxiliary (present perfect) or main verb contraction (e.g., 'Anselm's gone home.' = 'Anselm has gone home.').

「Anselm has」の短縮形（完了形の助動詞など）