Hello Monks Below is a little code that I successfully used to reformat an xml file from using 2 spaces for indenting to using a tab. I am curious if there is a better implementation than this silly system call. Thanks in advance! 
# set xmllint to use a tab over 2 spaces
$ENV{XMLLINT_INDENT} = "\t";
# create (gag) a system call to call 
# xmllint and then move the temp file 
# to the target file
my $syscall = 'xmllint --format '.$outfile.' > '.$outfile.'-lint;mv '.
+$outfile.'-lint '.$outfile;
# ensure the temp file does not exist.
unlink("$outfile-lint");
    
system($syscall);

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In reply to Calling xmllint better than using a system() by itsscott

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