I compared the validation results of the internal validation of Sigil 0.7.3 (no extra plugin installed) and the stand alone validator epubcheck 3.0.1.
Epubcheck finds several errors in the OPF file, which Sigil didn't find.
I'm not at all experienced in validation.
Is it true, that Epubcheck is more reliable than Flightcrew?
If so: Is there a way to integrate epubcheck into Sigil? Or is that planned for the future?
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