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<?xml version="1.0" encoding="UTF-8"?>
<config>
...
        <extension>txt</extension>
    </item>
</config>

Type of argument to keys on reference must be unblessed hashref or arr
+ayref at test.pl line 13.

use XML::Simple qw(:strict);
$config = XMLin('config.xml', KeyAttr => { server => 'name' }, ForceAr
+ray => [ 'server', 'address' ]);