Hi,
Indeed, this is a bug in the stylesheets that should be reported.
However, the space problem you see when you correct the bug is due to FOP
not supporting dbfo-need, or more precisely, not supporting the XSL-FO
feature that dbfo-need uses. The processor must be able to execute a
negative value for space-before, and FOP cannot. The stylesheet currently
ignores dbfo-need when fop.extensions="1", and now it appears it must also
ignore it when fop1.extensions="1".
Bob Stayton
Sagehill Enterprises
[email protected]
----- Original Message -----
From: "Thomas Schraitle" <[email protected]>
To: <[email protected]>
Sent: Thursday, July 02, 2009 6:48 AM
Subject: [docbook-apps] dbfo-need PI and invalid FO in FOP
Hi,
after some testing, it seems I found a bug in the FO stylesheets. However,
I thought, I
describe the problem so maybe someone can confirm it or correct me.
I have the following XML:
-----[ list-example.xml ]----
<chapter lang="en">
<title>Test-Chapter</title>
<para>This is an example.</para>
<procedure>
<step>
<para>Do this.</para>
</step>
<?dbfo-need height="5em" ?>
<step>
<para>Do that.</para>
</step>
</procedure>
</chapter>
When I translate the above XML into FO, I get the following error:
SEVERE: Exception
javax.xml.transform.TransformerException:
org.apache.fop.fo.ValidationException:
file:/local/doc/trunk/books/en/tmp/listexample.fo:3:391: Error(3/391):
fo:list-item-label is missing child elements.
Required Content Model: marker* (%block;)+
According to the FO specification, a fo:list-item-label[1] must have at
least on element from
the %block; parameter entity. So FOP rightly complains. :)
After some search, I found the respective lines in fo/pi.xsl. The attached
patch file intruduces
a xsl:if to check for the fop1.extensions and inserts an empty fo:block.
However, although it
fixes the validation problem in FOP, it creates a space between the first
and second step.
When I move the PI before the </step> tag, the validation error
disappears.
Any idea how to solve this?
Thanks,
Tom
-------
[1] http://www.w3.org/TR/xsl/#fo_list-item-body
$ rpm -q docbook-xsl-stylesheets libxml2 libxslt fop
docbook-xsl-stylesheets-1.75.1-6.1
libxml2-2.7.1-9.7.1
libxslt-1.1.24-19.1
fop-0.95-27.1
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