If you’re producing ePub files, take the time to ask yourself two simple questions:
Are all the files I listed in the OPF file actually in the ePub archive?
Are all the files in the archive in the OPF file?
The OPF file is meant to be the canonical listing of all resources in your ePub. If it’s [...]
The web-based method to validate ePub files against epubcheck has been updated to use epubcheck version 1.0.0, the first official release.
Additionally, the tei2epub library which bundles epubcheck has also been updated to include 1.0.0.
For one-off checks or use by non-developers, there is now a web front-end for the valuable epubcheck validation tool.
Uploaded files are run through the validator and any error messages are reported. The error report includes some notes to help decipher the sometimes-cryptic messages (notes are taken from the epubcheck wiki).
epub files are deleted immediately after [...]