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Yes, since epub:type attributes are only epub specific (ie. available in the epub namespace prefix) and aria-roles are native to the html5 spec, aria roles are more often used by assistive technologiesto help navigate websites. Yet the aria-roles are so generic that they do not easily handle book like landmarks that epub:type provides for. The actual mapping does not make much sense to me.
Putting a toc as a landmark/guide item makes sense but listing every chapter as a landmark really makes no sense to me as they are provided in the toc section of the nav.
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