Based on a clarified set of instructions from JS-R, I've now assigned Japanese_Provisional, EastAsian_Other and UC_Chinese ethnicities, using XQuery code to generate SQL insert statements from an XML dump of the db. I've left institutional owners completely alone, on the basis that the UC Database can tell us nothing about their ethnicity. I haven't deleted Asia_OtherUnknown or Unknown yet because there are 26 records which have the former and one which has the latter; I think it would make sense for someone to look at these, and assign them to Other if appropriate, or something else if not, manually.