Is it possible to use a ODI variable in a procedure

I am trying to call an external java program from the operating system (MS-DOS) using a procedure. This is possible using the os.system("<command>") syntax - declaring a procedure to use Jython. However, I want to be able to pass two ODI variables to the java program. I do not seem able to do this, is it possible ?
I also tried calling the OS command from within a package - but again cannot get the OS command to pass the variables.
I would appreciate any help on this.

Thanks for your response.
I am still unable to do this.
Problem is the procedure is "Jython" and it does not know what the ODI variables are.
I basically have two variables source and target which need to be passed to a java procedure.
So I created two VARIABLES in ODI - source and target.
I then have a procedure with the command;
import os
import sys
cmd = "java ConvFile"
rc = os.system(cmd)
when this runs it does not pass the variables.
if you have
import os
import sys
cmd = "java ConvFile"+#Tax_Updates.SourceFile+#Tax_Updates.TargetFile
rc = os.system(cmd)
then it does not know what #Tax_Updates.SourceFile and #Tax_Updates.TargetFile are and so just passes them as strings.
If you still think it is possible or anyone esle knows can you elaborate a little on the solution.
Thanks
Nick

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Is it possible to use a ODI variable in a procedure

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