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Subject: Re: [docbook-apps] Bad DOCTYPE on toc.ncx in epub2 stylesheets snapshot

Hi Jirka,

Thanks for the information.

It turns out that you were exactly correct.

In xhtml-1_1 (which epub2 uses), the files docbook.xsl, maketoc.xsl, and profile-docbook.xsl each contain the following line:

<xsl:output method="xml" encoding="UTF-8" indent="no" doctype-public="-//W3C//DTD XHTML 1.1//EN"

Apparently, this causes all files to have this doctype added, including content.opf and toc.ncx, which use different schemas.

When I remove the attributes doctype-public and doctype-system from this line in all three files, the problem goes away and the epub validates correctly against epubcheck.

BTW, your message reminded me that I ran into (and fixed) this same problem about a year ago, fixed it, and then forgot about it:-).

Update: I just went to sourceforge and found that this problem has been reported, closed, and reopened a couple of times:-). It looks like it may be a case where only some processors exhibit this behavior (possibly just saxon6). 

It's probably worth checking out with later versions of saxon and xsltproc, but I don't have the time to do that now. I'll try to look at it again in a week or so.

Best regards,
XML Press
XML for Technical Communicators

On Oct 2, 2014, at 1:35, Jirka Kosek <jirka@kosek.cz> wrote:

> On 2.10.2014 2:22, Richard Hamilton wrote:
>> <!DOCTYPE ncx
>>  PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd";>
>> There is a valid xmlns attribute on the root element, and if you remove the DOCTYPE lines completely, the file is fine. In 1.78.1 this does not happen.
>> I poked around the stylesheets, but couldn't figure out what's going on, and I didn't see anything in the revision history that seemed pertinent.
>> Has anyone run into the same thing?
> I never used EPUB2 stylesheets, but trouble spot is:
> <xsl:template name="ncx">
>    <xsl:call-template name="write.chunk">
>      ...
>      <xsl:with-param name="doctype-public" select="''"/> <!--
> intentionally blank -->
>      <xsl:with-param name="doctype-system" select="''"/> <!--
> intentionally blank -->
> Specifying empty doctype usually doesn't override doctype specified on
> xsl:output. You might try disabling doctype everywhere, it shouldn't
> matter even for XHTML content inside EPUB package.
> 				Jirka
> -- 
> ------------------------------------------------------------------
>  Jirka Kosek      e-mail: jirka@kosek.cz      http://xmlguru.cz
> ------------------------------------------------------------------
>       Professional XML consulting and training services
>  DocBook customization, custom XSLT/XSL-FO document processing
> ------------------------------------------------------------------
> OASIS DocBook TC member, W3C Invited Expert, ISO JTC1/SC34 rep.
> ------------------------------------------------------------------
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