You must define the list of elements and attributes that you want to include in the data instance -- in this case, the name, leave type, start date, and end date.
必须定义希望包含在数据实例中的元素和属性 —— 在这个示例中，是姓名、休假类型、开始日期和结束日期。
Common case: a novice just getting started get more out of date simply can not do the project after the end of what-income, and some even done a few months into the year have anything.
常见案例：一个刚入门的新手拿到些过时的项目后根本做不到什么保底收入，有的是做了几个月甚至一年也分文不入。
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