# File scripts/eval.rb, line 16
def get_ext_atts(ad)
  ext_atts = Hash.new
  ad.atts.keys.sort.each do |i|
    ad.atts[i].each do |f,v|
      # Store the value, unless it conflicts with a previous entry 
      ext_atts[f] = v unless ext_atts[f]
    end
  end
  return ext_atts
end