gistfile1.rb

module Definition
  def element(name)
    attr_accessor name
    define_method name.to_s+'?' do
      !!name # bound to local variable, not calling method. but !!send(name) is ugly
    end
  end
end

class Kitty
  extend Definition
  element 'purring'
end

k = Kitty.new
k.purring = false
puts k.purring? #=> true !