DTLL supports inheritance of type components (supertypes) and other features to support modularization and reuse of data type libraries.
DTLL支持类型成分的继承(超类型),以及其他支持数据类型库模块化和重用的特性。
That's what interface inheritance means; if you fulfill the contract of the more derived type then you are required to also fulfill the contract of the less derived type.
接口继承就是这样的;如果你要满足派生程度较高的类型的契约的话,你就必须要满足派生程度较低的类型。
There is inheritance, though: SDO understands an inheritance hierarchy among types, and given a property expecting a given type, you can assign a subtype.
但存在继承性:sdo理解类型间的继承层次结构,给定属性要求给定类型,可指派子类型。
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