Which variables are involved in a template?

[Javier Velez]

Hi,

I am developing a tool using velocity. In my application the user write 
down a template and then it is evaluated within a velocity context. But 
somtimes not all variables in template are found in the context. So I 
need a mechanism to recognize which variables could not be resolved.

One solution is evaluate once the template and then parse it looking for 
string maching with $xxxx or ${xxxx}. My question is: Is there any other 
more straitforward mechanism within the velocity API that give me the 
list of unsolved variables? Or at least, is there a method in velocity 
API that returns the list of referenced variables witin a template?

Thanks in forward.
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