Rails - Apr 2012 - data file path in a gem

I am trying to access a data list from inside a gem code, how should I
set the file path ..

here is my gem file structure  :
>> my_extension
      --- my_extension.gemspec
      --- Gemfile
      --- Gemfile.lock
      >> lib
          >> my_extension
                    ---  code_a.rb
                    ---  code_b.rb
                    ---  code_c.rb
           ---  my_extension.rb
           >> my_data
                    ---  data.yml

from inside code_a.rb, I am trying to load an array from the
data.yml :    data = YAML::load(File.open("data.yml"))
how should I set the path ??

thanks for feedback

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