数据对象还存放对元数据的引用，元数据提供有关包含在数据对象中的数据的信息。
The data object also holds references to metadata that provides information about the data included in the data object.
您可以请求返回元数据的片段（例如端点）、返回所有元数据以及同时返回元数据和文档。
You can request that fragments of metadata be returned (such as endpoints), all metadata be returned, and both metadata and documents be returned.
如果有元数据，你信任元数据中的信息吗？
Do you trust the information in the metadata, if it is in there?
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