page.margin.inner — The inner page margin
<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>The inner page margin is the distance from binding edge of the page to the first column of text. In the left-to-right, top-to-bottom writing direction, this is the left margin of recto pages.
The inner and outer margins are usually the same unless the output is double-sided.