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。
The key to achieving such integration is to build an enterprise-level metadata repository that ACTS as a single source of truth for all metadata requirements.
实现这种集成的关键是构建一个企业级的元数据存储库，作为所有元数据的单一可信来源。
It also makes it possible to retain metadata at source code level in class files, and at runtime controlled by a retention policy.
它还使得在类文件中以源代码级别保留元数据、并在运行时由保持(retention)策略控制成为可能。
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