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Narrator: The structure of EPUB files is precisely defined. Their metadata define a clear navigation hierarchy. The supporting files need to be stored and referenced as defined by the standard. The packaging of the resources needs to be done following a strict procedure. Otherwise, you risk your publication being unreadable by any e-book reader. No matter how careful you are or what tool you are using to create a book in EPUB format, a few mistakes can creep in. That is why you need to validate your e-book before distributing it. Validation is the process of making sure that your EPUB contains all the elements that e-book readers expect. An e-book reader can usually open an EPUB file that has not been validated; however, the contents might not render properly and the navigation might not work. The grade of accessibility is defined by the EPUB Accessibility specification of the World Wide Web Consortium. As there are clearly defined rules, we can use software tools to test our documents