Many thanks for this. You said
> Moreover, I don't think indicating the place by an anchor is necessary or accurate if you are modelling your semantic understanding of the text.
> If, however, you do care precisely where this is, <snip>
We don't currently have the resources to do a proper 2D mapping with zones and surface between XML and image, nor do we expect a grant for a comprehensive edition to stretch far enough for that. But in any case, with this material we don't think the payoff would really be worth it. Apart from the planned personography, annotation, search engine, etc., what we want above all is to (i) provide accurate text with as much continuity as possible, yet (ii) make it easy for a reader to line up text and image if desired. I'll have a look at the @rend option, but I'd be sorry to lose the visual clue on-screen (symbol with tooltip) that shows roughly where moved text has come from. An anchor in the XML makes that easy. Always willing to learn new tricks, though.