[Templates] Problem with Unicode Switching

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Hello

We use Template Toolkit now at several parts in our corporate intranet. 
We use iso encodings as standard encoding (8859-1 for german language / 
8859-2 for the new tchech language pages) . As database we use Oracle 
with DBD::Oracle.  Some parts of  the page use xml files (some config 
files, some content files...)  which we usually parse with XML::Simple. 

This combination sometimes leads to Template Toolkit switching to 
Unicode Output (the whole output is converted). The problem is that this 
happens in some of our Perl Modules on somehow random basis, so we can't 
predict what encoding the output is in. On the servers that are running 
perl 5.8 + it is no problem because i can do a check and convert it if 
needed, like ($encoding set to the right encoding for the needed language):


if ($] > 5.007) {
   if (Encode::is_utf8($output)) {
        $output=Encode::encode("$encoding",$output);
      }
}

but the problem is some of our production servers are still running perl 
5.6.1 and we can't upgarde them very easy. 
Changing all output to utf8 would be possible but a lot of work, since 
all our Database Data, and old Perl scripts that don't use Templates had 
to be converted to unicode too. 
The question now is how can I find out (using perl 5.6.1) if the output 
from Template Toolkit is converted to Unicode or not, the conversion 
would be no problem with Unicode::String?  I only need to know if i have 
to convert or not.


Kai

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