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