Update on SMIL DTD: I asked around and it seems no DTD is available. I tried converting the RelaxNG linked in the specs into a DTD using trang, but it fails with errors. Moreover, I believe the conversion cannot be lossless anyway, since RelaxNG allows for external namespaces, which EPUB 3 Media Overlays use indeed (e.g. epub:textref or epub:type).
Is having a DTD an hard requirement?
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