initialize_variables() private

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# File lib/rss/maker/base.rb, line 190
      def initialize_variables
        self.class.need_initialize_variables.each do |variable_name, init_value|
          if init_value.nil?
            value = nil
          else
            if init_value.respond_to?(:call)
              value = init_value.call(self)
            elsif init_value.is_a?(String)
              # just for backward compatibility
              value = instance_eval(init_value, __FILE__, __LINE__)
            else
              value = init_value
            end
          end
          instance_variable_set("@#{variable_name}", value)
        end
      end
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