1. Use XSLT 2.0 which has a tokenize() function
2. With XSLT 1.0, go to www.exslt.org
, find the str:tokenize template, and incorporate it into your code.
3. Or do the same thing by hand: it's a recursive template that uses substring-before() to extract the content before the first comma, and then calls itself to process the substring-after() the first comma.
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference