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Looks like VitalSource added some new features to their Page Fidelity format. They've added document structure metadata for each page, and now each glyph entry also have its corresponding character as an attribute. The structure metadata was probably designed for accessibility, in particular image alt-texts. The new glyph entries would make it slightly easier to convert PictureBooks to PDF, considering the corresponding text file won't need to be read.
Now, on to VitalSource's own documents. Wow, they are horrible in quality. The EPUB guide throws a whole bunch of errors in EPUBCheck. In fact, it's really just a Word document exported to HTML and converted/split with Calibre. The PDF guide is a complete mess, with every item in the TOC going to the wrong page and the highlighting being ludicrous, only highlighting around half of each letter. Some pages you can select the footer text, some pages you can't. If VitalSource can't even get their own documents working properly in their system, what business do they have ingesting others' contents?
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