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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 { ... }