For my extension, I want to change (many) element descriptions. But when I change the element description of e.g. abbr to 'oops', the generated description in the schema contains just the element's gloss: '(abbreviation)'. The description that was there is apparently successfully removed, but the new desc is not used.
The saved odd file says, however:
<elementSpec ident="abbr" module="core" mode="change">
The generated documentation also contains the new description.