page.height — The height of the physical page
<xsl:param name="page.height">
  <xsl:choose>
    <xsl:when test="$page.orientation = 'portrait'">
      <xsl:value-of select="$page.height.portrait"></xsl:value-of>
    </xsl:when>
    <xsl:otherwise>
      <xsl:value-of select="$page.width.portrait"></xsl:value-of>
    </xsl:otherwise>
  </xsl:choose>
</xsl:param>
The page height is generally calculated from the
paper.type and
page.orientation parameters.