Deck 22: the Semantic Object Model

Question 1

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

Answer 1

False

Question 2

A semantic object must represent something with a physical existence.

Answer 2

False

Question 3

A simple attribute has only one element.

Answer 3

True

Question 4

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

Question 5

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

Question 6

The term semantic means ________.

A)meaning
B)data
C)detailed
D)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

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

Question 9

What type of attribute is composed of other attributes?

A)Simple
B)Group
C)Compound
D)Composite

Question 10

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.

Question 11

Group attributes are composites of other attributes.

Question 12

Semantic objects are grouped into ________.

A)composites
B)entities
C)objects
D)classes

Question 13

What type of attribute has a single element?

A)Single
B)Simple
C)Link
D)Compound

Question 14

A subtype inherits all the attributes of its parent.

Question 15

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

Question 16

Object identifiers may or may not be unique.

Question 17

Semantic objects represent distinct identities.

Question 18

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

Question 19

A "simple object" can contain only simple attributes.

Question 20

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

Question 21

A parent object is also known as a(n)________.

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

Question 22

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

Question 23

Semantic objects are said to be ________.

A)Semantically self-contained
B)Semantically complete
C)Semantically inclusive
D)Both A and B are correct

Question 24

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

Question 25

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

Question 26

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

Question 27

Explain why semantic object attributes are called paired attributes.

Question 28

Which of the following statements about Subtype objects is not true?

A)Subtypes can be Inclusive (an object may be more than one subtype).
B)Subtypes can be Exclusive (an object may only be one of the subtypes).
C)Subtypes can be Nested.
D)All relations between the parent and subtype are 1:N.

Question 29

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

Question 30

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

Question 31

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

Question 32

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

Question 33

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

Question 34

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

Question 35

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