How to use the XSL variable Globally

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XSLT

hi ,

how to use the declare the variable in globally and use it other palce in XSLT
please see my code black

	<xsl:for-each select ="//DATEINFORMATION">
<xsl:variable name ="TotalAllMonthDaysOverrides" select ="$TotalAllMonthDays - $TotalOverrides"/>
<xsl:variable name="OverrideRate" select="$TotalAllMonthDaysOverrides"></xsl:variable>
</xsl:for-each>

Here the $TotalAllMonthDays and $TotalOverrides containing some integer values ..
now how can i use the OverrideRate variable at out side of the for each loop.
and also if every time the loop inside i need to add the TotalAllMonthDaysOverrides value and store into the OverrideRate variable.

That means
OverrideRate = TotalAllMonthDaysOverrides + TotalAllMonthDaysOverrides