CT sent me a link to the new, more precise specification of @facs, which aims to prevent my generalized usage of it as linking anything to a facsimile element. @facs will now be limited to "groups elements corresponding with all or part of an image, because they contain an alternative representation of it, typically but not necessarily a transcription of it." That's still pretty vague, but it's intended, I think, to exclude annotation. IMT needs to change to reflect this.

After some consideration, this is what I think should happen:

• Version 1.8 should add a new checkbox/boolean to the category properties, specifying that this category is transcriptional in nature (vague, but so is the above spec!). I haven't yet figured out a way to store this information in the <rendition> element of the TEI file. Perhaps I should just add an @facs attribute to the <rendition> tag, pointing at the <facsimile> element?
• Where this boolean is set, the annotations should be associated with the area using the @facs attribute; otherwise, the @corresp attribute should be used.

If this proves too complicated for the moment, a quick solution would simply be to switch from @facs to @corresp.