Lots more functions available: 
Monday, March 29, 2010
2:21 PM
Lots more functions available:
Math: +,-,*,/,mod, sum(XPATH), floor(number), ceiling(number), round(number), etc.
Type conversion: string(thing), number(thing)
String: starts-with(string,prefix), contains(string,pattern), string-length(string), etc.
Pasted from <[link]> 