For many aspects of a document's appearance, you can control the behavior of the stylesheets by changing parameters.
<xsl:param name="double.sided" select="1"/> <xsl:param name="page.margin.inner"> <xsl:choose> <xsl:when test="$double.sided != 0">1.25in</xsl:when> <xsl:otherwise>1in</xsl:otherwise> </xsl:choose> </xsl:param> <xsl:param name="page.margin.outer"> <xsl:choose> <xsl:when test="$double.sided != 0">0.75in</xsl:when> <xsl:otherwise>1in</xsl:otherwise> </xsl:choose> </xsl:param>
The parameters are described in the documentation that comes with the distribution.