Synopsis

    <xsl:attribute-set name="slides.titlepage.region-body.properties">
      <xsl:attribute name="margin-bottom">0pt</xsl:attribute>
      <xsl:attribute name="margin-top">0pt</xsl:attribute>
      <xsl:attribute name="column-count">
        <xsl:value-of select="$column.count.body"></xsl:value-of>
      </xsl:attribute>
    </xsl:attribute-set>