Purely as a matter of curiosity, why not use the example in the man-page? Once you have it in the file, use your XML took-kit of choice to rock'n'roll.

$rrd->dump()

    Available as of rrdtool 1.0.49.

    Dumps the RRD in XML format to STDOUT. If you want to dump it into
+ a file instead, do this:

        my $pid;

        unless ($pid = open DUMP, "-|") {
          die "Can't fork: $!" unless defined $pid;
          $rrd->dump();
          exit 0;
        }

        waitpid($pid, 0);

        open OUT, ">out";
        print OUT $_ for <DUMP>;
        close OUT;
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