Zapotec valence

Reading through the description of a proposed volume for Brill on valence-changing devices in Zapotecan languages. I'd like to contribute something on San Dionisio Ocotepec Zapotec.

Following Kaufman, the editors (Aaron S and Natalie O) talk about *o- as one of the markers of causative, but I have always thought of it in the terms that Briggs (1961) (and maybe Pickett, but I don't remember) laid out, where some of the aspect markers have two allomorphs. So the habitual is ru- for some verb classes and ri- for others, but the -u and -i portions of these prefixes are not synchronically segmentable.

Also, an interesting comparison to the causative in Copala Triqui, which is usually tuk- added to the verb. The t- portion here is cognate to si- or ti-/di- prefixes in Zapotec and Chatino; the u- is possibly cognate to *o-, and the k- to the fortition prefix.