#!perl

# process input & args...

my $plugin_name = 'Some::Module';
eval "use $plugin_name;" or die "can't load module";

my $output = $plugin_name->process($formatted_input);

# format output

print $formatted_output;

##</code><code>##

package Some::Module;
sub process {
  my ($package,$formatted_input) = @_;
  # do stuff;
  return $output;
}