I have an xsl that runs fine in several languages including zh-tw  but
not  for ko-kr (Korean) and simplified Chinese (zh-cn). It chokes when
it encounters xsl function such as "concat" or "normalize-space" and
returns an error message that "A sequence of more than one item is not
allowed as the first argument of normalize-space()"

I need to understand more about transforming multi-byte content and
troubleshooting problems such as this.

Can anyone give me some direction/resources regarding these matters?
Thanks,

Karen