'Editable' hint?

Hi,

I’m currently working on a new edition of my image annotation client
Annotorious [1], [2] and ran into the following use case. I wonder if
there’s a recommendation on how to deal with this from the spec perspective:

Implementers want to be able to flag individual annotations as either
‘editable’ or ‘not editable’. Not editable would simply mean that users
would not be able to change, add or remove annotation bodies (tags,
comments, etc.) and the UI would render a read-only presentation
accordingly.

Is there a way to represent such a boolean metadata flag in a
spec-compliant way?

Thanks,
Rainer

[1] http://github.com/recogito/annotorious
[2] http://github.com/recogito/annotorious-openseadragon
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