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use strict;
use warnings;
...
    <val>3</val>
  </node>
</opt>

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Number found where operator expected at c.pl line 12, near "<val>1"
        (Missing operator before 1?)
...
        (Missing operator before node?)
syntax error at c.pl line 8, near "?xml version="1.0"?>"
Execution of c.pl aborted due to compilation errors.