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  1. or download this
    package HTML::TreeBuilder;
    sub element_class { return "HTML::Element"; }
    ...
      my $ele = $self->element_class->new(...); #makes an HTML::Element pe
    +rhaps
      ..
    }
    
  2. or download this
    package My::TreeBuilder;
    use base qw(HTML::TreeBuilder);
    ...
    package My::Element;
    use base qw(HTML::Element);
    sub my_additional_method { ... }