"The Todo.pm module just has the annotations and no methods!"

If you did get the right code, then you have misunderstood the code. Open the source code up, you see two things:

1. The Todo module does have methods defined, for example: optional_unique_properties.

   sub optional_unique_properties {
       qw(
           class  completed  created  description  dtstamp
           dtstart  geo  last-modified  location  organizer
           percent-complete  priority  recurrence-id  sequence  status
           summary  uid  url
   
           due duration
       );
   }
   [download]

   If you do:

   use Data::Dumper;
   use strict;
   use Data::ICal::Entry::Todo;
   
   my $vtodo = Data::ICal::Entry::Todo->new();
   print Dumper($vtodo->optional_unique_properties());
   [download]

   You get the following, which makes sense.

   $VAR1 = 'class';
   $VAR2 = 'completed';
   $VAR3 = 'created';
   $VAR4 = 'description';
   $VAR5 = 'dtstamp';
   $VAR6 = 'dtstart';
   $VAR7 = 'geo';
   $VAR8 = 'last-modified';
   $VAR9 = 'location';
   $VAR10 = 'organizer';
   $VAR11 = 'percent-complete';
   $VAR12 = 'priority';
   $VAR13 = 'recurrence-id';
   $VAR14 = 'sequence';
   $VAR15 = 'status';
   $VAR16 = 'summary';
   $VAR17 = 'uid';
   $VAR18 = 'url';
   $VAR19 = 'due';
   $VAR20 = 'duration';
   [download]

2. It is "true" that the Todo module does not have a new() method defined, however, it says:

   use base qw/Data::ICal::Entry/;
   [download]

   So it inherits new() from its parent - Entry, which does have new():

   sub new {
       my $class = shift;
       my $self  = {
           properties => {},
           entries    => [],
       };
       bless $self, $class;
       return $self;
   }
   [download]