How can you effectively handle the sum of values extracted from XML elements in XSLT?

To handle the sum of values extracted from XML elements in XSLT, you can use the sum() function along with XPath to retrieve the values and calculate the sum. You can iterate through the XML elements and add their values to a variable to keep track of the total sum. ```xslt <xsl:variable name="totalSum" select="sum(//elementName)"/> ```