One brief comment - Always use the 2 argument form of bless,

bless($self,$class);
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so that the class can be subclassed. You may need to check the $class, depending on how it is called, so

my $proto = shift;
my $class = ref($proto) || $proto;
# stuff to create self
bless($self,$class);
[download]

is good practice. bless returns the item as well, so you could write your new() method as

sub new
  {
      my ($proto,$name,$type,$end) = @_;
      my $class = ref($proto) || $proto;
      return bless
      {
          name => $name,
          type => $type,
          end => $end,
          attributes => {},
      }, $class;
  }
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--
Brovnik

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