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Subject: Re: [docbook-apps] Using imageobject twice on title page fails (FO)

If you take a peek inside the generated titlepage.templates.xsl, you'll see that each of the title pages uses different modes to process their elements:

recto page:

<xsl:template match="mediaobject" mode="book.titlepage.recto.auto.mode">
  <fo:block xmlns:fo="http://www.w3.org/1999/XSL/Format";
    <xsl:apply-templates select="." mode="book.titlepage.recto.mode"/>

verso page:

<xsl:template match="mediaobject" mode="book.titlepage.verso.auto.mode">
  <fo:block xmlns:fo="http://www.w3.org/1999/XSL/Format";
    <xsl:apply-templates select="." mode="book.titlepage.verso.mode"/>

For many elements (including mediaobject), these modes eventually apply templates in the normal mode. That's why you get duplicate ids.

You'll need to add a template to your customization layer something like this:

<xsl:template match="mediaobject" mode="book.titlepage.verso.mode">

<!-- copy the contents of the normal template that matches on mediaobject (from fo/graphics.xsl) here, and remove the part that generates the id attribute. -->


(Add the namespace prefix d:mediaobject if you are using the namespaced stylesheets with DocBook 5).

Bob Stayton
Sagehill Enterprises

On 4/10/2015 5:52 AM, Kallauch, Benjamin (EEIN) wrote:
Hi group.
I want to display an image (mediaobject) twice on my book titlepages,
first on the recto page and second on the following verso page.
I made a simple extension to the “titlepage.templates.xml” file as
proposed by Bob. Here is an XML snippet:
<t:titlepage-content t:side="recto">
                   t:predicate="[position() = 1]"/>
<t:titlepage-content t:side="verso">
                   t:predicate="[position() = 1]" />
When I do this with other elements (i.e. <author>), everything is fine.
But if I do this with an image, the FOP complains about a previously
used ID:
org.apache.fop.fo.ValidationException: Property ID "N4000E" (found on
"fo:block") previously used; ID values must be unique within a document!”
I checked the FO-Output and indeed found the image block twice with the
same ID (“N4000E”). For the other elements there is no problem, because
they don’t get an ID (i.e. author).
Question: How can I reuse my image more than once on the recto/verso
title page.
I could insert a second imageobject (same file) and fetch it with
t:predicate="[position() = 2]” as a work around. But somehow I want to
keep my code easy and clean.
Can anyone help? Thanks.

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