![]() While it doesn’t require much more than EPUB 2 did (in the interest of backward compatibility), it accommodates the much richer metadata that makes publications so much more discoverable and dynamic, so much more usable and useful. EPUB 3 accommodates much richer metadata than EPUB 2 did, and it enables that metadata to be associated not just with the publication as a whole, but also with individual components of the publication and even with elements within the content documents themselves. This, of course, is what metadata is for: it’s not the content, it’s information about the content. And it enables publishers to provide that information in one clear, consistent form that all reading systems should understand, rather than in different, proprietary ways for each recipient system. It’s designed to enable reading systems to easily and reliably know, up front, what’s contained in a given publication, where to find each thing, what to do with it, how the parts relate to each other. What is arguably the most important thing about it is this: it organizes all the stuff in the box. In fact, EPUB is sometimes thought of as “a website in a box,” though it is actually much more than that. It is a publication format, and as such it specifies and documents a host of things that publications need to include-content documents, style sheets, images, media, scripts, fonts, and more, as discussed in detail in the other chapters of this book. epub, people sometimes fail to realize that EPUB is not just, and not mainly, a specification for the markup of content documents. (“Should I use EPUB or DocBook?” or, even worse, “Should I use EPUB or HTML5?” Hint: EPUB (pretty much) = HTML5.) Due partly to the convenient single-file format provided as. One of the most common misconceptions about EPUB is that it is a “flavor” of XML. ![]()
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