Object Oriented Database
The object definition language (ODL) is which of the following?

A method to implement a logical schema
A data definition language for OODB
Used to develop logical schemas
All of these

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Object Oriented Database
An extent is which of the following?

Only one instance of a class within a database
A keyword that indicates that the superclass inherits from a subclass
The set of all instances of a class within a database
A keyword that indicates that the subclass inherits from a superclass

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