refentry.title.properties — Title properties for a refentry title
<xsl:attribute-set name="refentry.title.properties">
  <xsl:attribute name="font-family">
    <xsl:value-of select="$title.font.family"></xsl:value-of>
  </xsl:attribute>
  <xsl:attribute name="font-size">18pt</xsl:attribute>
  <xsl:attribute name="font-weight">bold</xsl:attribute>
  <xsl:attribute name="space-after">1em</xsl:attribute>
  <xsl:attribute name="hyphenate">false</xsl:attribute>
  <xsl:attribute name="keep-with-next.within-column">always</xsl:attribute>
  <xsl:attribute name="space-before.minimum">0.8em</xsl:attribute>
  <xsl:attribute name="space-before.optimum">1.0em</xsl:attribute>
  <xsl:attribute name="space-before.maximum">1.2em</xsl:attribute>
  <xsl:attribute name="space-after.optimum">0.5em</xsl:attribute>
  <xsl:attribute name="space-after.minimum">0.4em</xsl:attribute>
  <xsl:attribute name="space-after.maximum">0.6em</xsl:attribute>
  <xsl:attribute name="start-indent"><xsl:value-of select="$title.margin.left"></xsl:value-of></xsl:attribute>
</xsl:attribute-set>
Formatting properties applied to the title generated for the
refnamediv part of output for
refentry when the value of the
refentry.generate.title parameter is
non-zero. The font size is supplied by the appropriate section.level
attribute-set, computed from the location of the
X.title.propertiesrefentry in the section hierarchy.
This parameter has no effect on the the title generated for
  the refnamediv part of output for
  refentry when the value of the
  refentry.generate.name parameter is
  non-zero. By default, that title is formatted with the same
  properties as the titles for all other first-level children of
  refentry.