Constants in PlugIns/Mixins

Hello,

currently I'm writing on a PlugIn for my Project.
In this PlugIn I MUST include two Constants. But where do I include
them?

Here's the Code of the PlugIn:

# Status
module ___Plugins
  module Internal #:nodoc:
    module Status #:nodoc:

      def self.included(base)
        base.extend ClassMethods
      end

      module ClassMethods
        def status
          include ___Plugins::Internal::Status::InstanceMethods
          extend ___Plugins::Internal::Status::SingletonMethods

          attr_accessor :public_state
          attr_accessor :commentable_state

          validates_inclusion_of :public_state, :in =>
PUBLIC_STATE
          validates_inclusion_of :commentable_state, :in =>
COMMENTABLE_STATE
        end

        PUBLIC_STATE = {
                    'closed' => 'Geschlossen',
                    'password_safe' => 'Password geschützt',
                    'friends_only' => 'Nur für Freunde offen',
                    'opened' => 'Offen'
                  }

        COMMENTABLE_STATE = {
                    'world' => 'Jeder',
                    'internal' => '___.de Nutzer',
                    'friends' => 'Nur Freunde',
                    'nobody' => 'Keiner'
                  }
      end

      # This module contains instance methods
      module InstanceMethods
        def can_see?(user)
          return false if self.user.is_ignored?(user)

          return true if self.public_state == "opened"
          return true if self.public_state == "password_safe"
          return true if self.public_state == "friends_only" &&
self.user.is_friend?(user)

          return false
        end

        def can_comment?(user)
          return false if self.user.is_ignored?(user)

          return true if self.commentable_state == "world"
          return true if self.commentable_state == "internal" && (user
&& User.find_by_id(user.id))
          return true if self.commentable_state == "friends" &&
self.user.is_friend?(user)
        end
      end

      # This module contains class methods
      module SingletonMethods

      end

    end
  end
end

Sorry but I have to mask the domain name with underscores.
The two constants are PUBLIC_STATE and COMMENTABLE_STATE.

When I run the Controller Action I get the following error message:
"uninitialized constant PUBLIC_STATE"

Source:
5: <pre><%= h album.description %></pre>
6: <p><a href="http://<%= current_user.login
%>.___.de/photoalbum/show/<%= album.permalink %>">http://<%=
current_user.login %>.___.de/photoalbum/show/<%= album.permalink
%></a></p>
7: <p>
8: Status: <%= PhotoAlbum::PUBLIC_STATE[album.public_state]
%><br />
9: Kommentieren: <%=
PhotoAlbum::COMMENTABLE_STATE[album.commentable_state] %>
10: </p>
11: <p>

But why? I mixed the module ___::Internal::Status into my PhotoAlbum
model class.

Greets
Christoph

Sorry for my bad english, but I am German.