Describes how to view the inheritance relationships between types.

说明如何检视型别之间的继承关系。

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Constraints: While facts describe relationships between types within the business domain, constraints describe limitations in that domain.

约束：事实描述业务领域中不同类型之间的关系，而约束(constraints)则描述那个领域中的限制。

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In addition to the requirement type, a hierarchy — or more generally, a set of valid relationships between requirement types — must be defined.

除了需求类型以外，层次——或更一般的说法，需求类型之间的一组有效的关系——必须要定义。

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"There are several robust sites around, but we like the flexibility XTF gives us in presenting data and uncovering relationships between different types of ETFs, " Mr. Colas says.

WSJ: Best Websites for Screening ETFs

However, as petrol and diesel engines are also improving, the relationships between the different types of vehicles are not constant.

BBC: Electric cars 'pose environmental threat'