To define a composite key, you simply take some attributes from the domain and combine them to provide the required degree of row uniqueness.

要定义组合键，只需从该领域中选择一些属性，并将其组合在一起，提供所需的行唯一性程度。

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Listing 3 shows how tasks and task groups are used in a composite cheat sheet and also explains additional attributes and elements.

清单3显示了如何在复合备忘单中使用任务和任务组，同时也解释了额外的属性和元素。

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Multiple attributes in the entity may be combined to form a composite primary key.

实体中的多个属性可以组合成一个复合的主键。

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