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-t epub3 from markdown produces "invalid ids" as reported by calibre #9412

Answered by jgm
georgernstgraf asked this question in Q&A
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As I understand it, these are not invalid IDs. epubcheck will not flag them as such.
The epub spec calls for XML-serialized HTML5, and characters like ü are allowed in HTML5 identifiers. It may be that there are readers that have trouble with them, but that is different from claiming that they are "invalid."

If this is a serious problem, though, we could consider adjusting our ids to be ASCII only. Comments welcome.

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