Take a look into XML::Smart:

  use XML::Smart ;

  my $xml = new XML::Smart() ;
  
  $xml->{hash} = \%t_type ;
  
  $xml->save('hash.xml') ;
  
  my $xml_load = new XML::Smart('hash.xml') ;
  
  my %t_type_load = %{ $xml_load->tree_ok->{hash} } ;
  
  use Data::Dumper ;
  print Dumper( \%t_type_load ) ;
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