Try telling standard out you have utf8 -

binmode(STDOUT, ":utf8");
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worked on my kit I did

use XML::DOM;
binmode(STDOUT, ":utf8");
my $XmlParserObj = XML::DOM::Parser->new();
my $doc = $XmlParserObj->parsefile("in.xml");
my $str = $doc->toString();
print $str;
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and the output included the characters.