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<global>
  <snmp>
...
  <node id="10.6.21.1"/>
  <node id="10.6.21.2"/>
</global>

my $i = XMLin("filename",forcearray => 1);
print "$i->{snmp}->{version}\n";

<snmp version="2c">
  <retries>2</retries>
  <community>public</community>
</snmp>