At one time or another, you may find yourself cornered into modifying EPUB files manually. This may be the result of certain validation errors that can’t be fixed using your favourite authoring software. In those cases, it’s best to work at the low-level and get your hands dirty, but nothing to fear. You can wash your hands afterwards.
Our experience with Kotobee showed us many forms of validations errors that are nearly impossible to correct using a software. No matter how much effort we put into Kotobee Author development, there are types of errors that are inevitable. Those errors originate from the user. For example, those who create their ebook by copying and pasting from their external PDF sources, can send along with their content a number of hidden meaningless characters, invisible to the eye, but visible (and prohibited) to the EPUB validator. That is a problem. Continue Reading