The prefix "epub" for attribute "epub:type" associated with an element type "nav" is

Hi,
I am deeply apologetic for the length of this message but I'm going through my files and attempts to create a valid epub.

I created an epub in late 2023 and had no problems and I'm using the same template to create a new epub, but when I run it on the various epub checking websites ( https://www.bookmarketing.pro/epub-validator.html, https://draft2digital.com/book/epubcheck/upload, https://www.epubconversion.com/epub-validator/ and
https://bookery.app/epub_validation )

I get the following error(s). I guess that in the two year's gap something has changed in the validation process. Can anyone help please?

These are the errors:

Code:

FATAL(RSC-016): epub/OEBPS/text/contents.xhtml(13,35): Fatal Error while parsing file: The prefix "epub" for attribute "epub:type" associated with an element type "nav" is not bound.



ERROR(RSC-005): epub/OEBPS/text/contents.xhtml(-1,-1): Error while parsing file: The prefix "epub" for attribute "epub:type" associated with an element type "nav" is not bound.

--------------------------------------------

This is the contents.xhtml file - its practically the same as the epub I created over a year ago with no problems. I've indicated with a /* .. */
where line 13, the source of the errors, is

I've omitted much of the file as its just a repetitive listing of county name in the UK

Code:

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE html>

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

<head>

<link href="../styles/mystyle.css" rel="stylesheet" type="text/css"/>

<meta http-equiv="default-style" content="text/html; charset=utf-8" />

<title>Contents</title>

</head>

<body>

<h2>Contents</h2>

<hr/>



    <nav id="toc" epub:type="toc"> /* error */





<table class="centertable">



<tr>

<td>

<a href="sameauthor.xhtml">By the same author</a>

</td>

</tr>



<tr>

<td>

<a href="intro.xhtml">Introduction</a>

</td>

</tr>



<tr>

<td>

<a href="updates.xhtml">Updates</a>

</td>

</tr>



</table>



<hr/>



<table class="centertable">



<tr>

<td>

England:

</td>

<td>

</td>

</tr>



<!-- rest of contents omitted for brevity -->



</table>





</nav>

</body>

</html>

My toc.ncx reads (with repetitive elements removed for legibility)

Code:

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

<!DOCTYPE html>

<ncx xmlns="http://www.daisy.org/z3986/2005/ncx/" version="2005-1">

  <head>

    <!--<meta name="dtb:uid" content="9781471652950"/>-->

    <meta name="dtb:depth" content="1"/>

    <meta name="dtb:totalPageCount" content="447"/>

    <meta name="dtb:maxPageNumber" content="447"/>

  </head>

  <docTitle>

    <text>Volume 2: Hotels</text>

  </docTitle>

  <navMap>

    <navPoint id="navpoint-1" playOrder="1">

      <navLabel>

        <text>Cover</text>

      </navLabel>

    </navPoint>



/* Extraneous elements snipped */



</navMap>

</ncx>

Based on this reply in this forum ( https://www.mobileread.com/forums/sh...d.php?t=285158 )
I've changed the head in toc.xhtml from

Code:

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

Code:

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

But now I get loads of errors!

Code:

ERROR(RSC-005): /OEBPS/text/contents.xhtml(16,28): Error while parsing file: element "table" not allowed here; expected element "h1", "h2", "h3", "h4", "h5", "h6", "hgroup" or "ol"



ERROR(RSC-005): /OEBPS/text/contents.xhtml(38,6): Error while parsing file: element "hr" not allowed here; expected element "h1", "h2", "h3", "h4", "h5", "h6", "hgroup" or "ol"



ERROR(RSC-005): /OEBPS/text/contents.xhtml(40,28): Error while parsing file: element "table" not allowed here; expected element "h1", "h2", "h3", "h4", "h5", "h6", "hgroup" or "ol"



ERROR(RSC-005): /OEBPS/text/contents.xhtml(461,6): Error while parsing file: element "hr" not allowed here; expected element "h1", "h2", "h3", "h4", "h5", "h6", "hgroup" or "ol"



ERROR(RSC-005): /OEBPS/text/contents.xhtml(463,28): Error while parsing file: element "table" not allowed here; expected element "h1", "h2", "h3", "h4", "h5", "h6", "hgroup" or "ol"



ERROR(RSC-005): /OEBPS/text/contents.xhtml(606,6): Error while parsing file: element "hr" not allowed here; expected element "h1", "h2", "h3", "h4", "h5", "h6", "hgroup" or "ol"



ERROR(RSC-005): /OEBPS/text/contents.xhtml(608,28): Error while parsing file: element "table" not allowed here; expected element "h1", "h2", "h3", "h4", "h5", "h6", "hgroup" or "ol"



ERROR(RSC-005): /OEBPS/text/contents.xhtml(628,7): Error while parsing file: element "nav" incomplete; missing required element "ol"

It now seems that table and hr are not allowed in the contents file?! <hr> is used at the top of file to separate
<h2>Contents</h2>
from the rest of the file and seems to be OK but when I used to to separate the tables, it now grumbles. It doesn't seem to like the use of these tags when between <nav>.

I'm especially bewildered about the final error, talking about the missing "ol" element.

Can anyone help?

With best wishes

Paul

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