epub3 to azw3 conversion

lumpynose · 05-18-2019, 03:11 PM

I'm teaching myself (or trying to) to format a public domain book in epub (original bare minimum formatted book from archive.org). I used the figure and figcaption tags on the images and then belatedly discovered that I need to use epub3 for that, so I used a converter for that.

I bring the book into calibre and convert it to azw3 prior to sending it to the kindle. Out of curiosity I looked at the azw3 file in calibre's editor and saw that the html is still using html5. The html tag at the top of a file is

Code:

<html xmlns="http://www.w3.org/1999/xhtml">

Whereas in the epub3 file it's

Code:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops">

Question 1: Pardon me for not having memorized all of those &%#@! html headers and their versions but what version of whatever is calibre's output using?

Question 2: The figures are still using the figure and figcaption tags; will that work with the kindle?

lumpynose · 05-18-2019, 03:41 PM

So answering my first question, the calibre output is xhtml, although according to google / the world wide web it's incorrect because it's missing the DOCTYPE line at the top.

jackie_w · 05-18-2019, 04:27 PM

Just a passing comment ...

As far as I recall, calibre has never used DOCTYPE in its epubs. I've also never had a problem actually reading a calibre-created epub on any of my Sony/Kobo eink devices or Android epub apps.

lumpynose · 05-18-2019, 04:51 PM

I haven't tried calibre's epub editor other than to eyeball an epub I've loaded into calibre and fix the css to change the text justification to ragged right. I started using Sigil and like it and so have stuck with it.

kovidgoyal · 05-18-2019, 09:55 PM

doctypes cause far more problems than they solve, which is why they have been retired from the HTML spec (html 5 just uses a generic docype that will never change). And that is why calibre does not use doctypes either.

05-18-2019, 03:11 PM	#1
lumpynose Wizard Posts: 1,086 Karma: 6719822 Join Date: Jul 2012 Device: Palm Pilot M105	epub3 to azw3 conversion I'm teaching myself (or trying to) to format a public domain book in epub (original bare minimum formatted book from archive.org). I used the figure and figcaption tags on the images and then belatedly discovered that I need to use epub3 for that, so I used a converter for that. I bring the book into calibre and convert it to azw3 prior to sending it to the kindle. Out of curiosity I looked at the azw3 file in calibre's editor and saw that the html is still using html5. The html tag at the top of a file is Code: <html xmlns="http://www.w3.org/1999/xhtml"> Whereas in the epub3 file it's Code: <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops"> Question 1: Pardon me for not having memorized all of those &%#@! html headers and their versions but what version of whatever is calibre's output using? Question 2: The figures are still using the figure and figcaption tags; will that work with the kindle?

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05-18-2019, 03:41 PM	#2
lumpynose Wizard Posts: 1,086 Karma: 6719822 Join Date: Jul 2012 Device: Palm Pilot M105	So answering my first question, the calibre output is xhtml, although according to google / the world wide web it's incorrect because it's missing the DOCTYPE line at the top.

05-18-2019, 04:27 PM	#3
jackie_w Grand Sorcerer Posts: 6,206 Karma: 16228558 Join Date: Sep 2009 Location: UK Device: Kobo: KA1, ClaraHD, Forma, Libra2, Clara2E. PocketBook: TouchHD3	Just a passing comment ... As far as I recall, calibre has never used DOCTYPE in its epubs. I've also never had a problem actually reading a calibre-created epub on any of my Sony/Kobo eink devices or Android epub apps.

05-18-2019, 04:51 PM	#4
lumpynose Wizard Posts: 1,086 Karma: 6719822 Join Date: Jul 2012 Device: Palm Pilot M105	I haven't tried calibre's epub editor other than to eyeball an epub I've loaded into calibre and fix the css to change the text justification to ragged right. I started using Sigil and like it and so have stuck with it.

05-18-2019, 09:55 PM	#5
kovidgoyal creator of calibre Posts: 43,843 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	doctypes cause far more problems than they solve, which is why they have been retired from the HTML spec (html 5 just uses a generic docype that will never change). And that is why calibre does not use doctypes either.