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#!/usr/bin/perl
use Data::Dumper;
...
<Parameter key="Key3">Some Value</Parameter> 
</ParameterGroup>
</Parameters>

#!/usr/bin/perl

...
    RootName => 'Parameters',
    KeyAttr => 'key',
);

<Parameters>
  <ParameterGroup ID="Group1">
...
    <Parameter key="Key3">Some Value</Parameter>
  </ParameterGroup>
</Parameters>