Add <dc:variable name="variable" expr="xpath"/> construct to datacage language. Each time during traversal of the template this element is found a variable called 'variable' is set to the result of the the evaluation of the XPpath 'xpath'. Example: <dc:variable name="x" expr="$x + 1"/> <!-- Assign x+1 to x -->

#!/bin/bash

bin_dir=`dirname $0`
bin_dir=`readlink -f $bin_dir`
exec java \
    -Dlog4j.configuration=file://$bin_dir/log4j.properties \
    -Dconfig.file=$bin_dir/../doc/conf-oracle.xml \
    -jar $bin_dir/etl.jar