XSLT - trim-whitespace function

Hi,
   I was wondering if the W3C had any plans to add a whitespace
trimming function to XSLT's function set.  The function would only trim
leading and trailing whitespace.  I am using XSLT to generate source code
where "internal" whitespace can play a significant role.  The function
normalize-space() would not work for me in this scenario.

Thanks a lot for your time.

Tim Stewart