How to Group and Sum values in xsl version 1 ? Grouping using muenchian method with generate-key function. Example code with explanation in below link. https://www.codeproject.com/Articles/1849/Grouping-XML-using-XSLT-2 You can download code from above link. Reference links http://www.jenitennison.com/xslt/grouping/muenchian.xml