One of our team had not quite understood how to figure out what the next id should be, so created a stack of new documents with ids duplicating existing ones; it took a while to sort this out, but I think it might be done now (Jenkins will tell me soon). One reason might have been the alpha-sorting of items by id in the A-Z Index, so I've done two things: rewritten the initial sort, and rewritten the JavaScript version that runs when you click on headers, so that MoEML ids are treated by the insertion of leading zeroes before sorting, to get a more intuitive order (so 11 sorts after 9, for instance, instead of before).