You can use four predefined annotation types — referred to as meta-annotations — to annotate your annotations.

您可以使用4种预定义的注释类型(称为元注释)对您的注释进行注释。

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Using annotations (also called attributes) you can even associate meta data to classes and some of their contents (operations, fields).

使用注解(也称为特性)，你甚至可以关联元数据与类和类的其他内容(操作、字段)。

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The default metadata source for validations is annotations, but the developers can extend the meta-data through the use of XML descriptors.

其默认的元数据源是注解，但开发者可以通过XML描述符对其进行扩展。

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