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# up at the top:
use My::Format::Foo;
...
      my $parser_class = 'My::Format::' . ucfirst $self->{'FILETYPE'};
      my $data = $parser_class->parse($_);

# Up top
use Module::Load;
...
my $module_name = 'My::Format::' . ucfirst $self->{'FILETYPE'};
load $module_name;
my $data = $module_name->parse($_);

my $module_filename = 'My/Format/' . ucfirst($self->{'FILETYPE'}) . '.
+pm';
require $module_filename;
my $module_classname = 'My::Format::' . ucfirst($self->{'FILETYPE'};
$module_classname->import();
my $data = $module_classname->parse($_);