(By Matthew S. Dryer): "This map shows the ordering of subject, object, and verb in a transitive clause, more specifically declarative clauses in which both the subject and object involve a noun (and not just a pronoun)... There are six logically possible orders of the three elements S, O, and V..."
Dryer is interested here in the position of full nominals: clauses in which "both the subject and object involve a noun (and not just a pronoun)". The map records the dominant order if there is one.