Hi Glenn,
I looked at the epub/docbook.xsl stylesheet, and it does have a custom template for
handling mediaobject. Unfortunately, it does not run the selection routine to pick
one of several imageobjects, so you get them all.
To see how it should be handled, look in xhtml/graphic.xsl, at the template starting
with:
<xsl:template match="mediaobject|mediaobjectco">
you will see that the first steps are to call the template named
'select.mediaobject.index', which should return one imageobject. That's where the
role attribute is used to select one of the imageobjects.
Out of the box, the supported values of role are 'html', 'xhtml', or 'fo', but you can
easily add a new one like 'epub' by setting the 'preferred.mediaobject.role'
stylesheet param. See this reference for more information.
http://www.sagehill.net/docbookxsl/GraphicSelection.html
Bob Stayton
Sagehill Enterprises
[email protected]
----- Original Message -----
From: "Glenn McDonald" <[email protected]>
To: <[email protected]>
Sent: Tuesday, July 13, 2010 10:59 PM
Subject: [docbook-apps] OPF file for EPUB is linking to images with different
roles
For Docbook 4.x, I was able to use the following to force PDF's to use SVG and HTML
Books to use PNG's:
<mediaobject>
<imageobject role="fo">
<imagedata fileref="screenshots/wizard_step_1.svg" scale="70"/>
</imageobject>
<imageobject role="html">
<imagedata fileref="screenshots/wizard_step_1.png" scale="70"/>
</imageobject>
</mediaobject>
This still works for PDF and HTML documents, however, I am finding that the epub
translation causes both of these images to be referenced in the OPF file:
<manifest>
...
<item id="d0e88" href="screenshots/wizard_step_1.svg"
media-type="image/svg+xml"/>
<item id="d0e94" href="screenshots/wizard_step_1.png" media-type="image/png"/>
...
</manifest>
The raw html output of the translated epub is (correctly) only referencing the .png
file
<div class="mediaobject"><img src="screenshots/wizard_step_1.png" width="378"
alt="Step 1 Image Data"/>
Incidentally, what "role" should an epub document be? role="epub" does not seem to
work. Is it "xhtml"?
Glenn
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
