At a high level, metadata refers to information about data, such as its definition, structure, source, etc.

从高层面上说，元数据指关于数据的信息，比如数据的定义、结构、来源等等。

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For example, you might discover that some data structure in the first data source is related to a data structure in another data source.

例如，你可能会发现第一个数据源中一些数据结构和另外一个数据源中的数据是结构相关联的。

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You can also use frameworks that decode the data structure information directly from class files, or even from source code.

也可以用框架直接从类文件解码出数据结构信息，甚至从源代码进行解码。

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