Deck 20: the Semantic Object Model

Question 1

Semantic objects are grouped into:

A)composites.
B)entities.
C)objects.
D)classes.
E)associations.

Answer 1

D

Question 2

The term "semantic" means:

A)meaning.
B)data.
C)detailed.
D)attribute.
E)true.

Answer 2

A

Question 3

Whether a developer uses an E-R model or a semantic object model,the eventual database design that is created should be exactly the same.

Answer 3

False

Question 4

Semantic objects represent the user's perceptions more closely than the E-R model.

Question 5

Object identifiers may or may not be unique.

Question 6

A "hybrid object" is a semantic object that relates two or more objects and stores data that are peculiar to that relationship.

Question 7

Semantic objects represent distinct identities.

Question 8

The key of an attribute is a description of an attribute's possible values.

Question 9

A semantic object must represent something with a physical existence.

Question 10

An association object relates two (or more)objects and stores data that are peculiar to that relationship.

Question 11

A "simple object" can contain only simple attributes.

Question 12

The first attribute of a subtype object is the childID attribute.

Question 13

A "composite object" cannot contain more than one multivalued attribute.

Question 14

A subtype inherits all the attributes of its parent.

Question 15

A simple attribute has only one element.

Question 16

Group attributes are composites of other attributes.

Question 17

An object identifier is one or more attributes that the users employ to identify object instances.

Question 18

What type of attribute is composed of other attributes?

A)simple
B)meta
C)group
D)compound
E)composite

Question 19

What type of attribute has a single element?

A)single
B)simple
C)link
D)compound
E)semantic

Question 20

The cardinalities of an attribute operate only between the attribute and the container of the attribute.

Question 21

Explain the concept of semantic objects as being a "sufficient description."

Question 22

A composite object is a semantic object that contains:

A)single-value,simple or group attributes,but no object attributes.
B)at least one object attribute.
C)at least one multi-value,simple or group attribute but no object attributes.
D)at least one multi-value,object attribute.
E)at least one group attribute but no object attributes.

Question 23

Subtype objects can be:

A)Inclusive subtypes.
B)Exclusive subtypes.
C)Nested subtypes.
D)Either B or C.
E)Either A,B,or C.

Question 24

A version object:

A)may be a composite object.
B)typically contains the archetype object in its identifier.
C)typically is a simple object.
D)produces archetype objects.
E)All of the above.

Question 25

Distinguish between the physical description and the semantic description of an attribute domain.

Question 26

Semantic objects are said to be:

A)Semantically self-contained.
B)Semantically complete.
C)Semantically inclusive.
D)Either A or B.
E)None of the above.

Question 27

A hybrid object is a semantic object that contains at least one:

A)single-value group attribute that includes a multi-value semantic object attribute.
B)single-value group attribute that includes any semantic object attribute.
C)multiple-value group attribute that includes a multi-value semantic object attribute.
D)multiple-value group attribute that includes any semantic object attribute.
E)group attribute and a semantic object attribute.

Question 28

Explain the differences between the E-R model and the semantic object model.

Question 29

A parent object is also known as a(n):

A)supertype object.
B)child object.
C)subtype object.
D)multiple-value object.
E)intersection object.

Question 30

Describe the two ways that semantic object views can be used.

Question 31

A compound object is a semantic object that contains at least one:

A)single-value,group attribute.
B)multi-value,simple or group attribute.
C)object attribute.
D)multi-value attribute.
E)group attribute.

Question 32

The relationship between a parent object and its associated subtype objects is a(n):

A)HAS-A relationship.
B)WANTS-A relationship.
C)NEEDS-A relationship.
D)IS-A relationship.
E)None of the above.

Question 33

A simple object is a semantic object that contains only:

A)single-value,simple or group attributes.
B)single-value,object attributes.
C)single-value,simple attributes.
D)multi-value,simple or group attributes.
E)simple attributes.

Question 34

A group identifier:

A)has more than one attribute.
B)identifies a group of instances.
C)identifies a group of attributes in an object.
D)is the identifier for a group of semantic objects.
E)links two objects.

Question 35

Explain why semantic object attributes are call "paired attributes."