body.font.size — Specifies the default font size for body text
<xsl:param name="body.font.size"> <xsl:value-of select="$body.font.master"></xsl:value-of><xsl:text>pt</xsl:text> </xsl:param>
The body font size is specified in two parameters
(body.font.master and body.font.size)
so that math can be performed on the font size by XSLT.