After having looked at the presence and absence of copulas with predicative noun phrases (Feature 73) and predicative locative phrases (Feature 75), we here compare the two constructions (following WALS feature 119, by Leon Stassen). The question is whether sentences corresponding to ‘I am a teacher’ and ‘I am in town’ are coded in a different or identical way.
If one or the two strategies involve zero coding (i.e. no copula is used), this zero-coding also counts as a strategy and is part of the comparison.