xmlns:epub=""

Karellen · 07-05-2022, 09:47 PM

When creating a new xhtml page in a epub v3.0 file, the following code is automatically added to the page...

PHP Code:


			
<?xml version='1.0' encoding='utf-8'?>

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

<head>

  <title>The Third Option</title>

  <link type="text/css" rel="stylesheet" href="OEBPS/Styles/stylesheet.css"/>

</head>



<body>

    

</body>

</html>

Is it possible to modify this so that it also automatically adds the following to the <html> tag...

PHP Code:


			
xmlns:epub="http://www.idpf.org/2007/ops"

Thank you

kovidgoyal · 07-05-2022, 10:07 PM

You shouldnt need to use the epub namesapce, the bright bulbs over at the epub spec committee realized namespaces are poison and replaced most of them with the role HTML attribute. What do you intend to use epub: for?

Karellen · 07-05-2022, 10:38 PM

Hi @kovidgoyal,

I am just starting to dive into the use of the epub:type attribute as I wanted to learn a bit more about it and its use, using this as a reference... https://www.w3.org/TR/epub-ssv/#sec-partitions

If I add one of these attributes, like <body epub:type="chapter">, and I don't add the namespace, then EPUBCheck gives the following error...

Code:

p01c21.xhtml ERROR(RSC-005): Error while parsing file: The prefix "epub" for attribute "epub:type" associated with an element type "body" is not bound.

So I need to add the namespace.

I initially started looking into this to experiment with the newer footnotes method of using the <aside> tag, but it does not seem to work on the Libra2, but thought I would continue learning about the attributes anyway.

Are you saying that the epub:type= attribute is not required/needed in epub v3?

kovidgoyal · 07-05-2022, 11:09 PM

Yes, it's not required. You can just use role instead, a bit of googling should find you the information for the role values.

Karellen · 07-05-2022, 11:32 PM

Quote:

Originally Posted by kovidgoyal

Yes, it's not required. You can just use role instead, a bit of googling should find you the information for the role values.

Oh, bugger. There's a few hours of wasted time and effort. Now to forget what I have learnt and start again on a different system.

Is it the Aria-Roles that I should be using?... https://www.w3.org/TR/wai-aria-1.0/roles

And it looks like a namespace is not needed as you stated.

What are your thoughts - is it worth going to the effort of adding the roles attributes throughout ebooks? Wondering if it is a waste of time for no foreseeable benefit.

kovidgoyal · 07-06-2022, 01:15 AM

ARIA roles are mostly useful for screen readers. How useful you find that depends on if you expect your work to be read using screen readers. As far as non-screen reader uses are concerned, the only useful one in my experience is the one for footnotes, since many viewers including the calibre one use this to make popup footnotes more robust.

Karellen · 07-06-2022, 02:53 AM

Thank you @kovidgoyal

07-05-2022, 09:47 PM	#1
Karellen Wizard Posts: 1,157 Karma: 4917718 Join Date: Sep 2021 Location: Australia Device: Kobo Libra 2	xmlns:epub="" When creating a new xhtml page in a epub v3.0 file, the following code is automatically added to the page... PHP Code: `<?xml version='1.0' encoding='utf-8'?> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>The Third Option</title> <link type="text/css" rel="stylesheet" href="OEBPS/Styles/stylesheet.css"/> </head> <body> </body> </html>` Is it possible to modify this so that it also automatically adds the following to the <html> tag... PHP Code: `xmlns:epub="http://www.idpf.org/2007/ops"` Thank you

07-05-2022, 10:38 PM	#3
Karellen Wizard Posts: 1,157 Karma: 4917718 Join Date: Sep 2021 Location: Australia Device: Kobo Libra 2	Hi @kovidgoyal, I am just starting to dive into the use of the epub:type attribute as I wanted to learn a bit more about it and its use, using this as a reference... https://www.w3.org/TR/epub-ssv/#sec-partitions If I add one of these attributes, like <body epub:type="chapter">, and I don't add the namespace, then EPUBCheck gives the following error... Code: p01c21.xhtml ERROR(RSC-005): Error while parsing file: The prefix "epub" for attribute "epub:type" associated with an element type "body" is not bound. So I need to add the namespace. I initially started looking into this to experiment with the newer footnotes method of using the <aside> tag, but it does not seem to work on the Libra2, but thought I would continue learning about the attributes anyway. Are you saying that the epub:type= attribute is not required/needed in epub v3?

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07-05-2022, 10:07 PM	#2
kovidgoyal creator of calibre Posts: 43,980 Karma: 22669822 Join Date: Oct 2006 Location: Mumbai, India Device: Various	You shouldnt need to use the epub namesapce, the bright bulbs over at the epub spec committee realized namespaces are poison and replaced most of them with the role HTML attribute. What do you intend to use epub: for?

07-05-2022, 11:09 PM	#4
kovidgoyal creator of calibre Posts: 43,980 Karma: 22669822 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Yes, it's not required. You can just use role instead, a bit of googling should find you the information for the role values.

07-06-2022, 01:15 AM	#6
kovidgoyal creator of calibre Posts: 43,980 Karma: 22669822 Join Date: Oct 2006 Location: Mumbai, India Device: Various	ARIA roles are mostly useful for screen readers. How useful you find that depends on if you expect your work to be read using screen readers. As far as non-screen reader uses are concerned, the only useful one in my experience is the one for footnotes, since many viewers including the calibre one use this to make popup footnotes more robust.

07-06-2022, 02:53 AM	#7
Karellen Wizard Posts: 1,157 Karma: 4917718 Join Date: Sep 2021 Location: Australia Device: Kobo Libra 2	Thank you @kovidgoyal