Here is what works for me:
my $sth = $dbh->prepare(<<SQL);
:out := xmltype.getclobval(v_xml);
$sth->bind_param_inout(':out', \my $xml, 32000);
I've noticed that for XMLTYPE output, Perl seems to need the explicit conversions to string whereas SQL Developer (and probably other SQL query tools) seem to do them automagically.
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