如果返回值是START_ELEMENT，则解析事件指示某一元素已经被解析。
If the return value is START_ELEMENT, the parse event indicates an element has been parsed.
在语法2中，-运算符用作一元求反运算符，指示表达式的负值。
In Syntax 2, the - operator is used as the unary negation operator to indicate the negative value of an expression.
在语法2中，-运算符用作一元求反运算符，指示表达式的负值。
In Syntax 2, the - operator is used as the unary negation operator to indicate the negative value of an expression.
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