Ruby on Rails：使用 XML 构建器部分

，并添加案例代码

ruby
xml = Builder::XmlMarkup.new(indent: 2)
xml.instruct!  # 添加 XML 声明
xml.products do
  xml.product do
    xml.name "iPhone"
    xml.price "999"
    xml.description "The latest iPhone model."
  end
  xml.product do
    xml.name "MacBook Pro"
    xml.price "1999"
    xml.description "Powerful laptop for professionals."
  end
end

ruby
xml = Builder::XmlMarkup.new(indent: 2)
xml.instruct!
xml.order do
  xml.order_number "12345"
  xml.customer do
    xml.name "John Doe"
    xml.email "john.doe@example.com"
  end
  xml.products do
    xml.product do
      xml.name "iPhone"
      xml.price "999"
    end
    xml.product do
      xml.name "MacBook Pro"
      xml.price "1999"
    end
  end
end