[docbook-apps] XSL custom chunk with navigation. e.g. legalnotice

[TiP <TiP at tut dot by>]

Hello docbook-apps,

  I need to chunk legalnotice with navigation headers with the
  following template.
---
<xsl:template match="legalnotice" mode="titlepage.mode">
  <xsl:variable name="id"><xsl:call-template name="object.id"/></xsl:variable>
  <xsl:variable name="filename">
    <xsl:call-template name="make-relative-filename">
      <xsl:with-param name="base.dir" select="$base.dir"/>
      <xsl:with-param name="base.name" select="concat($id,$html.ext)"/>
    </xsl:call-template>
  </xsl:variable>

  <xsl:variable name="title">
    <xsl:apply-templates select="." mode="title.markup"/>
  </xsl:variable>

  <xsl:call-template name="write.chunk">
    <xsl:with-param name="filename" select="$filename"/>
    <xsl:with-param name="quiet" select="$chunk.quietly"/>
    <xsl:with-param name="content">
      <xsl:call-template name="chunk-element-content">
        <xsl:with-param name="prev" select="/foo"/>
        <xsl:with-param name="next" select="/foo"/>
        <xsl:with-param name="content">
          <xsl:apply-templates mode="titlepage.mode"/>
        </xsl:with-param>
      </xsl:call-template>
    </xsl:with-param>
  </xsl:call-template>
</xsl:template>
---

  But compiler generates a warning:
---
No template for "/book/bookinfo" (or any of its leaves) exists
in the context named "title" in the "en" localization.
No template for "/book/bookinfo" (or any of its leaves) exists
in the context named "title" in the "en" localization.
---

  The problem is from my point of view, that parent of <legalnotice>
is <bookinfo> which is not a chunk and doesn't have <title> attribute
to process in "header.navigation" and "html.head" templates from
chunk-common.xsl by the

  <xsl:apply-templates select="$up" mode="object.title.markup"/>

instruction.
  Though I could define such template solely for /book/bookinfo, this
will not fix the problem with "UP" link in generated legalnotice
point to the same chunk as "HOME". So, to make it correct I need to
reproduce a whole "footer.navigation" template with a small addition

  <xsl:variable name="row1" select="count($prev) &gt; 0
                                    or (count($up) &gt; 0 and local-name($up) != 'bookinfo')
                                    or count($next) &gt; 0"/>

  I'd like to make my solution more universal and I can see it like make
$up variable contain not parent, but correct first chunk element along
ancestor axis. The problem is that I can't see a way to do this. Current
$up value in 1.66.1 XSL is

  <xsl:variable name="up" select="parent::*"/>

  I wonder also if it will be possible to include such customization in
XSL distribution? (if there is any, of course)
-- 
 TiP