(By Matthew S. Dryer): "This map shows the position of case affixes on nouns, especially whether they are prefixes..., or suffixes... A morpheme is considered a case affix for the purposes of this map if it attaches to nouns and signals a grammatical or semantic relation to some other word, most commonly a verb. Some case affixes mark arguments of the verb, such as the ergative case affix in (1b), while others signal the semantic relationship of a noun phrase that is not an argument, as with the instrumental case affix in (1a). While case prefixes are much less common than case suffixes, they are nevertheless attested..."