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Subject: Re: [docbook-apps] Conceptual Questions and Customizations Regarding EPUB2 Stylesheets


Is there any reason why not to use the epub3 stylesheets?

As far as I can tell epub2 stylesheets are not being actively maintained. Bob has done an awesome job with epub3 and thy should be readable by older devices out of the box.


Sent from my iPad

On Apr 9, 2013, at 4:37 AM, Thomas Schraitle <tom_schr@web.de> wrote:

> Hi,
> currently, I'm trying to understand some design decisions around the
> EPUB2 stylesheets:
> 1. base.dir
>   HTML files are generated relative to "base.dir", but the OEBPS and
>   META-INF directories are _not_ created relative to "base.dir" but
>   rather relative to the current working directory (if using the
>   default). The paths have to explicitly be specified with
>   "epub.oebps.dir" and "epub.metainf.dir". This behaviour is
>   unexpected and does not make sense.
>   Solution:
>   Paths specified with "epub.oebps.dir" and "epub.metainf.dir" should
>   be treated as being relative to "base.dir":
>   Wrong (current behavior):
>   base.dir         /tmp/my_epub
>   epub.oebps.dir   /tmp/my_epub/OEBPS
>   epub.metainf.dir /tmp/my_epub/META-INF
>   Correct (expected behavior):
>   base.dir         /tmp/my_epub
>   epub.oebps.dir   OEBPS             (=> /tmp/my_epub/OEBPS)
>   epub.metainf.dir META-INF          (=> /tmp/my_epub/META-INF)
>   Furthermore, if you set "epub.oebps.dir" to an absolute path, this
>   path will be used as a value for <rootfile full-path="PATH"> element
>   in META-INF/container.xml, creating an invalid EPUB archive.
> 2. No admonition graphics
>   see
>   https://sourceforge.net/tracker/?func=detail&aid=2849681&group_id=21935&atid=373747
> 3. Complicated zip file generation (manifest wanted) 
>   The easiest way to create the EPUB zip-file would be to write a
>   zip-readable manifest file. The stylesheets already "know" the
>   complete filelist - it is written to OEBPS/content.opf anyway.
>   Writing a manifest file (when "generate.manifest" is set to 1) to
>   use with zip is much more effective than parsing content.opf or
>   trying to determine which files to put into the archive by other
>   means.
>   Such a manifest would also help to solve a problem with the
>   callout-graphics. Callout-graphics are _only_ listed in
>   OEBPS/content.opf if they are referenced in the HTML (that is, of
>   the profiled XML contains <co> or <calloutlist> elements and
>   callout.graphics is set to 1). If the XML sources do not contain
>   <co>/<calloutlist> they are not referenced in  OEBPS/content.opf.
>   The EPUB zip file must only contain files that are referenced in
>   OEBPS/content.opf, otherwise it will not validate.
>   As a consequence, a check for callouts need to be performed before
>   creating the zip archive. In addition to this,
>   callout.graphics.number.limit and callout.graphics.extension need to
>   be checked as well in order to get a list with the needed callout
>   graphics. (The ruby script to generate the EPUBs does all this).
>   The same would apply to admonition graphics if they would be
>   supported by the EPUB stylesheets.
>   This creates a massive overhead for the EPUB post processing step
>   (aka copying the files and creating the archive) which could totally
>   be avoided by creating a manifest.
> 4. Modularisation
>   Probably a minor issue, but a stylesheet with more than 1700 lines
>   should be split into separate files. :)
> 5. xsl:element vs. literal 
>   Maybe this is a matter of taste, but the EPUB2 stylesheet 
>   contains sometimes a lot of verbose structures, for example:
>     <xsl:element  namespace="http://www.idpf.org/2007/opf";
>                   name="package">
>   This could be expressed more compact as:
>     <package xmlns="http://www.idpf.org/2007/opf";>
>   Is there a reason why to use xsl:element instead of the literal
>   element?
> What do you think?
> -- 
> Gruß/Regards,
>    Thomas Schraitle
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