Rails - May 2013 - Nesting modules inside of a Rails eninge gem

What is the proper syntax to nest child modules within a parent module that 
is being as an isolate_namespace Rails engine gem?

# lib/myengine/engine.rb
module MyEngine
  class Engine < Rails::Engine
    isolate_namespace Myengine
    # def ...
  end
end

For example. The parent module is MyEngine and the child module is Blog. 
MyEngine will share common domain, like CRUD, Taggable, Searchable, etc, 
which will keep the gem code DRY and isolated from the main app (MyApp)

Are either of the two approaches correct? Any advice?

# A
# lib/myengine/blog.rb
module MyEngine
  module Blog
    # def ...
  end
end

# B
# lib/myengine/blog.rb
module MyEngine
  class Engine < Rails::Engine
    isolate_namespace Myengine
    module Blog
      # def ...
    end
  end
end

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