Embedded scripts

Hi !

I have to call an external function in my xslt/xsl-fo stylesheet. I know that I can use <xsl:script> according to the recommendation (http://www.w3.org/TR/xslt11/#define-extension-functions) The question is how to actually use it ? I'm using formatter to transform my stylesheets and I have to add an external function written in a different language than xslt, preferably C++ or C#. Is that possible ? I mean I don't really understand the way that it works. Actually will it work just fine if I use a java code inside the <script> tags ? I don't understand how the code is interpreted or compiled. Can anyone lighten it up a but for me ? In the specification it's stated that my processor must support the language of the script. I'm supposed to use the integrated one. What languages are supported by him ? I looked through the internet and found some microsoft references(http://msdn.microsoft.com/en-us/library/533texsx(vs.71).aspx) but the problem is that I don't want to process the xml outside the formatter and If I understood that microsoft article clearly they tell me to write a program in C# that will do the transformation outside. It's not my goal 'cause I need something to be done in one step just using my formatter.

thanks in advance for any tips.