This is the XSL sum() function I have came up with. Now Where to I place it??
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:template match="/">
<p>ytdExpenses= <xsl:value-of select="sum(monthlyExpenses)"/></p>
</xsl:template>
</xsl:stylesheet>