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For what it's worth, I have converted some epub2 books to epub3 to allow better use of accessibility features. The books are used with a voice reader program for visually impaired users which makes use of quite a few epub3 accessibility options such as using a <hr/> to give an audible indicator of a scene break. For me, it was a learning project, for the users, it made their listening experience a bit more enjoyable.
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