@gregoriopellegrino raised the need in the EU to identify publications that fall under one of the three exemptions from the accessibility requirements. ONIX is adding three new values to code list 196 to address this (75-77).

We're currently not aware of any existing metadata property that could be used to specify this information, so it sounds like we may need to add a new accessibility property.

It would be best to begin the discussion of what the property should be named and what values it should accept here, as we can add properties to the a11y: namespace without updating the specification (epubcheck won't complain).

Once we have a solid proposal in place, we can look at whether the new property can be added to the accessibility standard, but this may qualify as a class 4 change.