Thread: Empty dc:language causing error in v1.9.20
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Old 11-21-2022, 07:03 PM   #7
KevinH
Sigil Developer
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Unfortunately the doctype mend on open and epub well formed check only work on/check xhtml files not the OPF.

Doitsu's wonderful epubcheck plugin is how we recommend you validate a full epub including the OPF. If you check your input epub with epubcheck it should detect the missing dc:language value.
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