You might find glazou’s “epub fun” series of posts amusing. e.g. [link]Posted by Edward O'Connor at
As someone who has written a validatator that validates what amounts to that same thing, I’m curious as to why Daniel states that it is quite painful and costly to test.
That being said, using namespaces in attribute values is generally thought to be a layering violation, and a bad idea for many other reasons.Posted by Sam Ruby at
Where does EPUB use namespaces in attribute values? It seems to me it uses things that look like qNames in content but aren’t.Posted by Henri Sivonen at