SDO also provides a metadata API, which allows applications, tools, and frameworks to introspect the data model for a data graph.
SDO还提供了一个元数据api，允许应用程序、工具和框架对数据图形的数据模型进行自检。
This metadata API not only defines the shape of the data in the relational data store, but also defines the queries associated with that data and establishes relationships between different objects.
这种元数据API不仅定义关系数据存储中数据的形式，而且定义与该数据相关联的查询，并建立了不同对象之间的关系。
Provides general information about how to use the metadata API, an overview of tokens, and coding conventions.
提供有关如何使用元数据api的常规信息、标记概述以及编码约定。
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