i'm new to Docbook, so I apologize for any stupid question.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:import href="" href="https://cdn.docbook.org/release/xsl/current/fo/docbook.xsl">https://cdn.docbook.org/release/xsl/current/fo/docbook.xsl"/>
<!-- Standard Schriftgrösse -->
<xsl:param name="body.font.master">11</xsl:param>
<!-- Schriftart für Fliesstext ändern -->
<xsl:param name="body.font.family">"Calibri"</xsl:param>
<!-- Schriftart für Titel ändern -->
<xsl:param name="title.font.family">"TrajanPro-Bold"</xsl:param>
<!-- Farbe für Überschriften und Titel -->
<xsl:param name="title.color">#014A78</xsl:param>
<!-- Grafik für Kopfzeilen -->
<xsl:param name="header.image.filename">../images/my.svg</xsl:param>
<!-- ... -->
<xsl:param name="toc.section.depth">2</xsl:param>
<xsl:param name="insert.xref.page.number">0</xsl:param>
<!--
Voreinstellung: Seitenlayout
-->
<xsl:param name="page.orientation">portrait</xsl:param>
<xsl:param name="page.height.portrait">297mm</xsl:param>
<xsl:param name="page.width.portrait">210mm</xsl:param>
<xsl:param name="page.margin.inner">20mm</xsl:param>
<xsl:param name="page.margin.outer">15mm</xsl:param>
<xsl:param name="page.margin.top">10mm</xsl:param>
<xsl:param name="region.before.extent">17mm</xsl:param>
<xsl:param name="body.margin.top">30mm</xsl:param>
<xsl:param name="region.after.extent">15mm</xsl:param>
<xsl:param name="page.margin.bottom">10mm</xsl:param>
<xsl:param name="body.margin.bottom">22mm</xsl:param>
<!-- Kein Einzug für Fliesstext -->
<xsl:param name="body.start.indent">0pt</xsl:param>
<!-- Lange Zeilen umbrechen (z.B. Listings) -->
<xsl:param name="fop1.extensions">1</xsl:param>
<xsl:param name="hyphenate">true</xsl:param>
<xsl:param name="hyphenate.verbatim" select="1"/>
<!-- Einseitige PDF Dokumente (Bildschirm) -->
<xsl:param name="double.sided">0</xsl:param>
<!--
Voreinstellung: Kopfzeile
-->
<xsl:template name="header.content">
<xsl:param name="pageclass" select="''"/>
<xsl:param name="sequence" select="''"/>
<xsl:param name="position" select="''"/>
<xsl:param name="gentext-key" select="''"/>
<fo:block>
<!-- sequence can be odd, even, first, blank -->
<!-- position can be left, center, right -->
<xsl:choose>
<xsl:when test="$sequence = 'blank'">
<!-- nothing -->
</xsl:when>
<xsl:when test="$position='left'">
<!-- Same for odd, even, empty, and blank sequences -->
<xsl:call-template name="draft.text"/>
</xsl:when>
<xsl:when test="($sequence='odd' or $sequence='even') and $position='center'">
<!-- nothing -->
</xsl:when>
<xsl:when test="$position='center'">
<!-- nothing for empty and blank sequences -->
</xsl:when>
<xsl:when test="$position='right'">
<!-- Same for odd, even, empty, and blank sequences -->
<!--<xsl:call-template name="draft.text"/>-->
<fo:external-graphic content-height="25mm">
<xsl:attribute name="src">
<xsl:call-template name="fo-external-image">
<xsl:with-param name="filename" select="$header.image.filename"/>
</xsl:call-template>
</xsl:attribute>
</fo:external-graphic>
</xsl:when>
<xsl:when test="$sequence = 'first'">
<!-- nothing for first pages -->
</xsl:when>
<xsl:when test="$sequence = 'blank'">
<!-- nothing for blank pages -->
</xsl:when>
</xsl:choose>
</fo:block>
</xsl:template>
Anpassung Schriftarten für Titel etc.
-->
<!-- Anpassung Schriftart für Titelseite -->
<xsl:template match="d:title" mode="book.titlepage.recto.auto.mode">
xsl:use-attribute-sets="book.titlepage.recto.style" text-align="center" font-size="32pt"
space-before="18.6624pt" font-weight="bold" font-family="{$title.fontset}" color="{$title.color}">
<xsl:call-template name="division.title">
<xsl:with-param name="node" select="ancestor-or-self::d:book[1]"/>
</xsl:call-template>
<fo:block space-before="1em" space-after="1em">
<fo:external-graphic src="" content-height="50%"
scaling="uniform"/>
</fo:block>
</fo:block>
</xsl:template>
<!-- Anpassung Schriftart für Kapitel -->
<xsl:template match="d:title" mode="chapter.titlepage.recto.auto.mode">
xsl:use-attribute-sets="chapter.titlepage.recto.style" font-size="22pt"
font-weight="bold" space-after=".4in" color="{$title.color}">
<xsl:call-template name="component.title">
<xsl:with-param name="node" select="ancestor-or-self::d:chapter[1]"/>
</xsl:call-template>
</fo:block>
</xsl:template>
<!-- Anpassung Schriftart für Abschnittstitel Level 1 -->
<xsl:attribute-set name="section.title.level1.properties">
<xsl:attribute name="color">
<xsl:value-of select="$title.color"/>
</xsl:attribute>
<xsl:attribute name="font-size">
<xsl:value-of select="$body.font.master * 1.2"/>
<xsl:text>pt</xsl:text>
</xsl:attribute>
</xsl:attribute-set>
<!-- Anpassung Schriftart für Abschnittstitel Level 2 -->
<xsl:attribute-set name="section.title.level2.properties">
<xsl:attribute name="color">
<xsl:value-of select="$title.color"/>
</xsl:attribute>
<xsl:attribute name="font-size">
<xsl:value-of select="$body.font.master * 1.1"/>
<xsl:text>pt</xsl:text>
</xsl:attribute>
</xsl:attribute-set>
<!-- Anpassung Schriftart für Abschnittstitel Level 3 -->
<xsl:attribute-set name="section.title.level3.properties">
<xsl:attribute name="color">
<xsl:value-of select="$title.color"/>
</xsl:attribute>
<xsl:attribute name="font-size">
<xsl:value-of select="$body.font.master"/>
<xsl:text>pt</xsl:text>
</xsl:attribute>
</xsl:attribute-set>
<!-- Anpassung Schriftart für Anhang -->
<xsl:template match="d:title" mode="appendix.titlepage.recto.auto.mode">
xsl:use-attribute-sets="appendix.titlepage.recto.style"
margin-left="{$title.margin.left}" font-size="22pt" space-after=".4in"
font-weight="bold" font-family="{$title.fontset}" color="{$title.color}">
<xsl:call-template name="component.title">
<xsl:with-param name="node" select="ancestor-or-self::d:appendix[1]"/>
</xsl:call-template>
</fo:block>
</xsl:template>
<!-- Anpassung Schriftart für allgemeine Beschriftungen -->
<xsl:attribute-set name="formal.title.properties" use-attribute-sets="normal.para.spacing">
<xsl:attribute name="font-weight">bold</xsl:attribute>
<xsl:attribute name="font-size">9pt</xsl:attribute>
<xsl:attribute name="hyphenate">false</xsl:attribute>
<xsl:attribute name="space-after.minimum">0.4em</xsl:attribute>
<xsl:attribute name="space-after.optimum">0.6em</xsl:attribute>
<xsl:attribute name="space-after.maximum">0.8em</xsl:attribute>
</xsl:attribute-set>
</xsl:stylesheet>
Thanks for help.