You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: xml.rb
    path of file: ./repos/ekylibre/lib/aggeratio
    
    the code of the file until where you have to start completion: module Aggerat
    
    def build
      # Build code
      code = parameter_initialization
      code << "builder = Nokogiri::XML::Builder.new do |xml|\n"
      code << build_element(@root).dig
      code << "end\n"
      code << "return builder.to_xml\n"
      code
    end

    def build_element(element)
      method_name = "build_#{element.name}".to_sym
      code = ''
      if respond_to?(method_name)
        code << conditionate(send(method_name, element), element)
      elsif element.name.to_s != 'comment'
        # Rails.logger.warn("Markup <#{element.name}> is unknown or not implemented")
        code << "# #{element.name}: not implemented\n"
      end
      code
    end