"When the chef-client loads cookbook attribute files, it does so in alphabetical order for all the cookbooks. If one attribute file must be loaded before another, use the `include_attribute` method." -- [Attribute File Ordering](http://docs.opscode.com/essentials_cookbook_attribute_files.html#attribute-file-ordering)

We don't need to use `include_attribute` in this case since there is no dependency on the other attribute files or their ordering.