The title slide will be output for the [s:]authors element:
<xsl:template match="s:slides/s:authors"> <fo:block break-after="page" text-align="center" font-weight="bold"> <fo:block font-size="150%"><xsl:value-of select="preceding-sibling::s:title"/></fo:block> <xsl:apply-templates/> </fo:block> </xsl:template>
The [fo:]block element acts a lot like XHTML's p element.