继承是一个耦合机制：它使用关于可见性、方法调度等定义明确的规则绑定两个实体。

Inheritance is a coupling mechanism: it binds two entities together with well-defined rules about visibility, method dispatch, and so on.

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构造型提供了元模型级的继承，而标记在元模型级提供了向构造型增加类属性信息的机制。

While a stereotype offers metamodel-level inheritance, a tag offers a metamodel-level mechanism to add attribute-like information to a stereotype.

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同样地，WSDL 1.1甚至没有包含一种机制来提供接口继承。

As such, WSDL 1.1 did not even contain a mechanism allowing for interface inheritance.

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