相反，XML则使用重复的开始和结束标记包装数据值。
In contrast, XML USES duplicate start and end tags to wrap data values.
开始和结束标签之间的值作为参数传递给Title类的构造函数。
The value between the starting and ending tags is passed as argument to the constructor of the Title class.
class属性以空白开始和结束，包含一系列空白分隔的值。
The class attribute starts and ends with white space, and contains a list of blank-delimited values.
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