<m:mfenced separators=",">
<m:mn> <xsl:apply-templates select="text()[1]"/> </m:mn>
<m:mn> <xsl:apply-templates select="text()[2]"/> </m:mn>
<m:mfenced separators=",">
<m:mn> <xsl:apply-templates select="text()[1]"/> </m:mn>
<m:mn> <xsl:apply-templates select="text()[2]"/> </m:mn>