Re: DOCBOOK-APPS: xsl fo conversion pb with customization layer.

[Bob Stayton <bobs at caldera dot com>]

> From: Matthieu Paindavoine <mpaindav@toad.net>
> 
> I found a file that redefines the behavior of variablelist, and I would
> like to use it as part of a customization layer. alas, I am not so
> successful, and I would be glad if someone could provide some pointers.
> 
> I have my main xsl document: matt.xsl
> 
> 
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> 		xmlns:fo="http://www.w3.org/1999/XSL/Format";
> 		extension-element-prefixes="fo"
> 		version="1.0">
> 
> <xsl:import href="docbook.xsl"/>
> <xsl:include href="variablelist.xsl"/>
> 
> </xsl:stylesheet>
> 
> 
> which calls: variablelist.xsl
> 
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> 		xmlns:fo="http://www.w3.org/1999/XSL/Format";
> 		version="1.0">
> 		
> <xsl:template match="variablelist">
>   <xsl:variable name="id"><xsl:call-template name="object.id"/></xsl:variable>
> <xsl:apply-templates name="variablelist"/>
> </xsl:template>
> 
> <xsl:template match="varlistentry">
>   <xsl:variable name="id"><xsl:call-template name="object.id"/></xsl:variable>
>   <fo:block xsl:use-attribute-sets="list.item.spacing">
>     <xsl:apply-templates/>
>   </fo:block>
> </xsl:template>
> 
> <xsl:template match="varlistentry/term">
>   <fo:inline><xsl:apply-templates/>,  </fo:inline>
> </xsl:template>
> 
> <xsl:template match="varlistentry/term[position()=last()]" priority="2">
>   <fo:inline>
> <xsl:apply-templates/></fo:inline>
> </xsl:template>
> 
> <xsl:template match="varlistentry/listitem">
> <fo:block start-indent="{count(ancestor::*)*.05}in">
> <xsl:apply-templates/></fo:block>
> </xsl:template>
> 
> </xsl:stylesheet>
> 
> 
> When running this through the fop blender, I get the following:
> 
> /usr/bin/xsltproc /home/matt/docbook-xsl-1.44/fo/matt.xsl main.xml > main.fo
> Making portrait pages on USletter paper (8.5inx11in)
> xsltApplyOneTemplate: failed to find extension block
> xsltApplyOneTemplate: failed to find extension block
> xsltApplyOneTemplate: failed to find extension block
> xsltApplyOneTemplate: failed to find extension block
> /usr/lib/j2sdk1.3/bin/java -classpath /home/matt/test/classes.zip:/home/matt/test/xerces.jar:/home/matt/test/xalan.jar:/home/matt/test/batik-1.0/batik.jar:/home/matt/test/batik-1.0/batik-svgbrowser.jar:/home/matt/test/batik-1.0/batik-svgpp.jar:/home/matt/test/fop.jar org.apache.fop.apps.Fop -fo main.fo -pdf main.pdf
> security properties not found. using defaults.
> FOP 0.19.0-CVS
> using SAX parser org.apache.xerces.parsers.SAXParser
> building formatting object tree
> WARNING: property 'linefeed-treatment' ignored
> setting up fonts
> formatting FOs into areas
>  [1] [2]
> rendering areas to PDF
> writing out PDF
> 
> Presumably the patch is correct, so it must be the way I apply that
> customization... Could you please indicate what I did wrong?
> I have tried different xsl processor (xalan and xslt) and they both
> stumble on that pb. I have also noticed that the extension block error
> is linked to the <fo:block> in the template varlistentry.
> 
> It seems to me that the error is that by copying this chunk out of the
> main xsl file, I loose some context information. But I don't know
> exactly what it is.

According to my reference book (Michael Kay's XSLT
Programmer's Reference 2nd ed), the scope of
extension-element-prefixes attribute is the stylesheet
module, not the full stylesheet tree constructed by
applying <xsl:include> and <xsl:import>. So I think
the <xsl:stylesheet> element in variablelist.xsl
needs to include:

		extension-element-prefixes="fo"

That should clear up the "failed to find extension block"
errors.

bobs
Bob Stayton                                 400 Encinal Street
Publications Architect                      Santa Cruz, CA  95060
Technical Publications                      voice: (831) 427-7796
Caldera International, Inc.                 fax:   (831) 429-1887
                                            email: bobs@caldera.com

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