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Nav elements containing multiple images generating FATAL(RSC-016) #1476
Description
I'm seeing the below message in epubcheck 5.0.0 (run via terminal, Mac OS Monterey) when there are multiple images in a nav entry. The file has no errors in epubcheck 4.2.6.
As far as impact goes, it's unusual to have images in a nav, it's even more unusual to have 2. This affects 2 out of the +6000 recent files I checked. It's also unusual to have the message duplicated, we don't usually see fatal errors so not sure if that's normal.
Validating using EPUB version 3.3 rules.
A sequence of more than one item is not allowed as the second argument of concat() (@alt="", @alt="") . Found while atomizing the first argument of fn:concat()
FATAL(RSC-016): [file path on my computer]/OEBPS/nav.xhtml(-1,-1): Fatal Error while parsing file: A sequence of more than one item is not allowed as the second argument of concat() (@alt="", @alt="") . Found while atomizing the first argument of fn:concat()
Check finished with errors
Messages: 1 fatal / 0 errors / 0 warnings / 0 infos
EPUBCheck completed
<nav epub:type="toc" role="doc-toc" aria-labelledby="toc">
<h1 id="toc">Contents</h1>
<ol>
<li><a href="xhtml/title_page.xhtml">Some text <img class="inline1" width="9" height="13" src="images/an_image.png" alt="" /> some text <img class="inline1" width="9" height="13" src="images/a_second_image.png" alt="" /></a></li>
</ol>
</nav>
Activity
rdeltour commentedon Jan 19, 2023
This definitely looks like a false positive; at first sight I see nothing non-conforming in the markup. Thanks for the report @nekennedy!
Im any case, it should not cause a fatal error.
rdeltour commentedon Jan 19, 2023
From the error message, it appears to be caused by an XPath expression in one of the schematron schema, probably the nav doc schema.
fix: allow nav items containing multiple images