(By Leon Stassen): "This map shows the possible relationships between the encoding of nominal and locational predicates. In particular, the map shows for each language whether nominal predications (such as John is a tailor) and locational predications (such as John is in Paris) can or cannot be encoded by the same strategy. In the terminology of Stassen (1997), a language is called a share-language if the encoding strategy for locational predications is (or can be) used for nominal predications, and a split-language if the encoding strategies for the two constructions must be different."
From the examples (and the discussion in Stassen (1997)), it becomes clear that "nominal predication" refers to classificational clauses (where there is an indefinite nominal occurring as predicate), and "locational predication" refers to predlocative clauses (where there is a definite nominal in the subject position). Equational clauses are not treated here, and existential clauses (while involving a locational expression) lack a definite subject.