Without an identifier, there is no way to represent an entity as metadata.

如果没有标识符，我们就没有办法把这个实体表现为元数据。

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If it applies to the current transition and entity, the plug-in will undertake the required validation, adding metadata where required.

如果适用于当前的转换和实体，则插件将执行必需的验证，并在所需的地方添加元数据。

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For better readability, the relationships in our scenario are expressed through object or relational metadata specified directly in the entity class files.

为了提高可读性，通过在实体类文件中直接指定的对象或关系元数据表达场景中的关系。

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