Instances are listed by instance id and you can add or remove them.
实例按实例ID列出，您可以对其添加或删除。
For identity relationships the array can contain at most one instance id.
对于身份关系，该数组最多只能包括一个实例ID。
It sets the instance id as the key attribute of the generic customer object.
它会将实例ID设置为通用客户对象的键属性。
An instance of the relationship connects the two properties using an instance id.
关系的实例使用实例ID连接两个属性。
An instance of the relationship connects the two properties using an instance id.
关系的实例使用实例ID连接两个属性。
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