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In addition to beefing up the capabilities of exporting to EPUB in general, that I talked about in a previous video, Adobe has also added the ability to Export to EPUB 3, which is the newly ratified format for EPUB documents. And I'll show you some of the specifications in a bit. But for now, let's just take a look at it in the Export to EPUB dialog box. Go to File, down to Export, and we are going to export this as arthistory to the desktop. In the EPUB Export Options dialog box, at the top, all you need to do is switch the version from EPUB 2 to EPUB 3.
And now let's go ahead and export this. So, this is Adobe Digital Editions, supporting the EPUB 3 format a bit. It looks pretty good. It's a very simple book. More interestingly, let's actually close this and unzip the files. So I'm going to go to the Finder and take that arthistory file and just drag and drop it on top of my unzipped script, and I included this in the exercise files, so it's just a convenience for Mac users. If you're working on a PC, you don't need a script; just change the extension from that .epub to .zip and then right-click on the .zip file and choose Extract All.
Then you'll be able to look at the contents in a folder, just like on the Mac. And if we open up the OEBPS folder, you can see that it included an EPUB-2-friendly NCX document. This is what is often called the navigational table of contents. So this can be viewed on an EPUB 2 reader, but it also included the new EPUB-3-only XHTML toc. Let's go ahead and open this up. So it's simply a list of all the different sections, and it uses the HTML5 tag called nav.
Let's make sure that this validates. On the desktop, I do have a validation checker for EPUB 3, right here, epubcheck_3. So I am going to drag and drop it right on there. Yay! My favorite kind of alert. If you're on Windows, you can validate your EPUB 2 or EPUB 3 files by going to the online EPUB check service hosted at validator.idpf.org. I don't know of any drag-and-drop EPUB check scripts for Windows, but that's what I like to use on a Mac.
Now if I try to validate it for EPUB 2--drag and drop it here-- we have bunch of errors. So this is specifically for EPUB 3. Now there is one other format that I want to call your attention to. If we go back to Export to EPUB--let me just add a 2 here, and that is this last one EPUB 3 with layout-- and if you choose that one, you get the scary red X. And it's a very interesting thing. Now this is not EPUB 3 with fixed layouts, which is a different title that I did at lynda.com on how to create fixed-layout EPUBs like cookbooks and children's books.
That's now this is talking about. This is EPUB 3 with a different kind of layout, and probably something more like an adaptive layout, if you have been watching the other videos all about liquid layout rules and alternative layouts. I think what's happening is that the industry is sort of merging between EPUBs and digital publishing for tablets. So we are all trying to move toward a future where you create one adaptive document that can work on lots of different things. That's sort of what this is really get across. It says it's an experimental format, Adobe is working on it. There's nothing that can read it yet.
I'm not even sure why they included it. My guess is that's at some point in the next, you know, few months maybe or a year, there is going to be something that we can do with this; otherwise, they would have saved it for another version. It says, "NOTE: Currently, this version will only work with specific Adobe viewer technologies," but as far as I know, there is none of those viewer technologies available, yet. But let's try something anyway, shall we? Let's go ahead and use it and just go crazy. We are going to export to that format. Apparently, you can't use split documents here.
We can include CSS if we had an idea were doing. Let's just go ahead and export it and take a peek inside, shall we? So that was saved down to the desktop, arthistory2, and if we open up in Digital Editions, what might happen? Well, I sort of see it. It looks kind of weird though. I am not quite sure what's happening on the inside. So let's unzip it, drag and drop it on top of the scripts, take a peek inside.
We have the same two table of contents files, one HTML file. Interesting. There is two CSS files. I didn't include to. But here is the default, and here's one that ends with PGT, which I'm guessing is for page template, which is a technology that I have been reading about. Let's take a look at the XHTML file. And this is interesting, a whole bunch of classes for basic text frames and anchors and so on.
I am scrolling all the way down to the bottom, xfootnotes. So you can go ahead and investigate it as much as you like, and I've been having fun actually experimenting with different kinds of books. Like, for example, if I export Lost_Highway, which was the book that I used for my fixed-layout EPUB, I export that one to EPUB using their EPUB 3 with Layout. And let's unzip that one. Go back to the finder. There is Lost_Highway and then drag and drop it onto unzip and open up Lost_Highway.
Now we see even more interesting things, so all these classes with pics and pos and image. Hmm. There is just a little bit of text toward the end and then page anchors. If we look at the CSS file-- let's see what this PGT one says-- epub transforms, translates, epubx -wrap-flow so they're working on something interesting here.
I would direct your attention to a couple of articles that you might find of interest, if you want to learn more about what's happening with EPUB 3 with Layout. Well, first sure is an EPUB 3 overview that you should know about. So when you're exporting to just regular EPUB 3, here is all the different specifications for EPUB 3. This is at the ibpf.org, if you just look for EPUB. Now, the specification for EPUB 3 is a link right off their website. But on epubsecrets.com, which is a blog that I help manage, the editor Matthew Diener wrote a very good article recently all about CSS page templates in EPUB 3.
And it appears that he is writing about all the information he can find with what's happening in the future for EPUB 3, for EPUB 3 documents to be able to have adaptive layouts. And I know that there is a team working on this at the IBPF. And here he's giving more examples and links to where you can learn more about it on the IBPF website also. They did a workshop in advanced adaptive layouts with more information on this topic.
So, a couple of interesting things to play around with in InDesign, when you export to EPUB 3. We all know what EPUB 2.0 is about, hopefully, and lots of great new features in InDesign for that. EPUB 3, once we get devices that can read EPUB 3, InDesign will be ready to export books for them. And then I guess something happening coming down the pike, EPUB 3 with Layout. Very interesting and something to keep an eye on.
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