带注解的类包含JAXB运行时解析xml(为了进行编组和反编组)所需的所有信息，还可以通过一个可选的步骤检验文档。
The annotated classes contain all the necessary information for the JAXB runtime to parse the XML for marshalling and unmarshalling, and in an optional step, to validate documents.
在运行时，使用jaxb库进行编组和反编组。
At runtime, JAXB libraries are used in marshalling and unmarshalling.
现在要创建另一个主要运行时工件，反编组器。
We are now ready to create the other main runtime artifacts, the Unmarshaller.
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