> The Saxon documentation
> http://www.saxonica.com/documentation/xsl-elements/sort.html
> says:
>    "The value of the lang attribute can be an ISO language 
> code such as "en" (English) or "de" (German). It determines 
> the algorithm used for alphabetic collating. The default is 
> based on the Java system locale. 
> The only collating sequence supplied with the Saxon product is "en" 
> (English), but other values may be supported by writing a 
> user-defined comparison class. 

That's out of date, I'm afraid. Will fix. You can use any language code so
long as the Java VM (or rather, your java VM) has a Locale for it, and the
collation you get is the one defined in the Java locale.

Regards,

Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay