Rails - Jan 2010 - Specifying a named scope in a mixin?

I would like to specify a named scope in a Module, to keep DRY. Example:

class Article <  < ActiveRecord::Base

  include ReferenceData

  # ...
end

module ReferenceData

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

  module ClassMethods

    named_scope :released,    :conditions => {:is_released => true}

  end

end

This does not work:
>> Article.released
NoMethodError: undefined method `named_scope'' for
ReferenceData::ClassMethods:Module

Do you know how to specify my named scope inside a mixin module?
Thanks a lot,
Ewald
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