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InDesign CS4 does not yet ask for this pub-date metadata when creating an epub, nor create it in its exported epubs. It should always have done so, since correct pub-date metadata is required by the OPF part of the epub specification. If MM is provided, a two-digit day (DD) is optional.īackground: As of version 1.0.5, EpubCheck started checking for correctly formed pub-date metadata in epubs. That date format means the four-digit year (YYYY) is mandatory, and a two-digit month (MM) is optional. That is, instead of an empty self-closing dc:date tag, you’re inserting an opening dc:date tag, with the date in the format YYYY], and closing the tag. (If you don’t have a tag, just add the line.) #Epub metadata editor read only error codeTo fix the date: in the metadata section of your content.opf file, replace this code If you check your epub with epubcheck version 1.0.5 or later, you may get this error message: ERROR: title.epub/OEBPS/content.opf(2): date value '' is not valid, YYYY] expected Troubleshooting the epub’s ‘date’ metadata your epub metadata does not contain the ebook title. ![]() Or you could read this post by wildly opinionated stirrer Mike Cane, which sums up the issue well. The problem you are having is caused by incomplete or missing metadata(ebook details) in the epub i. For instance, those by Laura Dawson or Michael Cairns. There are lots of sensible pieces written about metadata. In this very useful note on identifiers by Liza Daly, she uses ISBNs as identifiers like this: urn:isbn:9780596158347 Further reading on metadata There are slight variations on how metadata can be entered in an epub. You can add more metadata if needed, using Dublin Core tags.įor example, you can put a book’s blurb or jacket copy in a dc:description tag. The ‘dc’ stands for Dublin Core, a standardised list of metadata items.
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