Quote: can extend imported Oberon data types without losing compatibility with the base type; motivation for the Oberon language

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A more sophisticated and more powerful extensibility applies … data types that extend imported types. Variables of … into already-existing data structures. Operations are polymorphic in … those of the extended types. This form of … appears to be a prerequisite for genuine extensibility … The development of the language Oberon was largely …   Google-1   Google-2

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Quote: Oberon has polymorphic operations

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