[Boilerplate4U]

Originally Posted by kovidgoyal

What are these publishers of yours that dont set scheme? In my experience, they all either specify the scheme or prefix with urn:isbn, both of which calibre will handle. In any case, this will handle it: https://github.com/kovidgoyal/calibr...1f76f8f4394382

Wow, before I even started to think about a practical solution. Many thanks!