Also has three optional sub-elements.
还有三个可选的子元素。
Id, price and quantity - sub-elements of item.
price和quantity——项目的子元素。
An RSS file is made up of a element and its sub-elements.
RSS文件由一个元素及其子元素组成。
The various sub-elements occur in the listed order (if at all).
各种子元素以列出的顺序（如果有的话）出现。
The various sub-elements occur in the listed order (if at all).
各种子元素以列出的顺序（如果有的话）出现。
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