The main questions you raise are thorny and require more thought and
effort than I can dedicate right now, and likely really deserve the
attention of a workgroup. In the meantime, however, I would recommend
changes that are more easily converted to whatever the workgroup
decides to do with this in the future. In your case that means
creating a new element rather than re-purpsosing the resp= of <corr>.
And briefly, is it sacrilige to re-purpose an attribute? Well, I
suppose not, but neither is it a good idea. Among other things, the
result is that our textbases could never be combined or searched at
the same time, at least not for queries involving this feature.