这种方法同样适用于属性值和内容中的字符数据。

This is true for character data in attribute values as well as content.

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再添加一个类和该类中的一个属性和方法。

Also add a class and an attribute and a method within the class.

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说明方法和属性主体中不允许的变更。

Describes what changes are not allowed in method and property bodies.

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说明方法和属性主体中不允许的变更。

Describes what changes are not allowed in method and property bodies.

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