How to make dynamic call-template ?

I need to call different section of the subtemplate based on the value in the variable (or tag value in the XML data).Trying to do like this:

<?call-template:xdoxslt:get_variable($_XDOCTX, 'v_subtemplate')?> where v_subtemplate variable contained the proper name

Not working for me.

Am i using correct syntax or need to go different route ?

THANKS in advance for ANY suggestions.