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$VAR1 = {
  'requirement' => [
...
    }
  ]
};

use strict;
use XML::Simple;
...
<requirement contactname="Joe Average">A power cord.</requirement>
<requirement contactname="Jane Smith" contactnumber="555-1212">A node 
+name</requirement>
</xml>

$VAR1 = {
  'requirements' => [
...
    }
  ]
};

$VAR1 = {
  'method' => [
...
    }
  ]
};