[xsl] equivalent od #define

["Robert Van Gemert" <rcvangemert@xxxxxxxxxxxxxxxx>]

Hi,

I am using msxml single pass transforms and am trying to implement #define 
and #ifdef statements. The aim is to establish the value of constants based 
on the value of another constant. The values need to be defined only once 
but are based on another value.  I have tried using <xsl:choose> statements 
outside a template but this is not allowed. Can somebody suggest a strategy 
to achieve this as part of the stylesheet.

Thanks,

Robert Van Gemert