Deck 22: the Semantic Object Model

Question 1

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

Answer 1

False

Question 2

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

Answer 2

False

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

What type of attribute has a single element?

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

Question 5

A "simple object" can contain only simple attributes.

Question 6

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

Question 7

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

Question 8

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

Question 9

The term "semantic" means:

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

Question 10

A simple attribute has only one element.

Question 11

A subtype inherits all the attributes of its parent.

Question 12

Group attributes are composites of other attributes.

Question 13

Object identifiers may or may not be unique.

Question 14

Semantic objects are grouped into:

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

Question 15

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

Question 16

Semantic objects represent distinct identities.

Question 17

What type of attribute is composed of other attributes?

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

Question 18

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

Question 19

A semantic object must represent something with a physical existence.

Question 20

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

Question 21

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 22

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 23

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

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

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 26

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 27

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

Question 28

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 29

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

Question 30

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)a group attribute and a semantic object attribute.

Question 31

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

Question 32

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

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

Question 33

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

Question 34

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.
D)multi-value.
E)group.

Question 35

Subtype objects can be:

A)inclusive subtypes.
B)exclusive subtypes.
C)nested subtypes.
D)Either B or C.
E)Either A,B or C.