11. Specifying a key ensures that no two objects belonging to a class have the same value for the key attribute(s).

A. True
B. False

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12. If you know all the possible values that an attribute can have, you can enumerate those values in ODL.

A. True
B. False

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13. You may specify an object identifier with only one unique tag name.

A. True
B. False

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14. In ODL, you specify an operation using parentheses after its name.

A. True
B. False

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15. An ordered collection of elements of the same type are called sets.

A. True
B. False

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