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Allow NCX doctype external identifier? #2045
Description
The doctype was allowed in EPUB 2:
<!DOCTYPE ncx PUBLIC "-//NISO//DTD ncx 2005-1//EN" "http://www.daisy.org/z3986/2005/ncx-2005-1.dtd">
We don't have an exception for it in Appendix B, though, so it would still be invalid in EPUB 3 even after the loosening for SVG/MathML.
I don't know how much it was used in EPUB 2, but should we add to simplify any porting forward of content?
Activity
dauwhe commentedon Mar 8, 2022
I'm a bit torn. I hope we make the NCX so inconvenient that it disappears. But allowing standard DTDs also makes sense.
mattgarrish commentedon Mar 9, 2022
Ya, I don't think allowing the doctype will change much either way, though. Who's going to read an appendix on external identifiers? 😉
The more likely outcome is we start getting issues in the epubcheck tracker complaining that epubcheck is allowing doctypes in svg but not in the ncx.