The class tag maps the order object to the ORDERS table and has a number of sub tags that describe its properties, the ID and the order name, and a one-to-many relationship to models.Item.

class标签把ORDER对象映射到ORDERS表，还有许多子标签用于描述其属性、ID订单名称，以及同models . Item的一对多关系。

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Id, price and quantity - sub-elements of item.

price和quantity——项目的子元素。

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The detailed data contains the ID, acronym, name, lead name, lead title, and total number of employees within the organization as well as its sub-organizations of all levels.

详细数据包含ID、首字母缩写、名称、负责人姓名、负责人头衔、组织及其各级子组织中职员的总数。

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