Enhanced Entity Relationship Model

Question 1

Specialization

Answer 1

process of defining a set of subclasses of an entity type

Question 2

Disjointness constraint

Answer 2

an entity can be a member of at most one subclass

Question 3

Total specialization

Answer 3

every entity must be a member of at least one subclass

Question 4

Partial specialization

Answer 4

an entity can belong to no subclass

Question 5

Specialization hierarchy

Answer 5

every subclass has only one parent

Question 6

Specialization lattice

Answer 6

subclass can have more than one parent

Question 7

Shared subclass

Answer 7

subclass with more than one superclass

Question 8

Abstraction concepts

Answer 8

(1) classification and instantiation
(2) identification
(3) specialization and generalization
(4) aggregation and association

Question 9

Classification

Answer 9

Assigning similar objects/entities to object classes/entity types

Question 10

Identification

Answer 10

abstraction process where classes and objects are made unique by an identifier

Question 11

Aggregation

Answer 11

abstraction process for building composite objects from their components

Question 12

Association

Answer 12

abstraction process for associating objects from several independent classes

Question 13

Ontology

Answer 13

specification of a conceptualization

Question 14

Conceptualization

Answer 14

set of concepts and relationships that are used to represent the part of reality or knowledge that is of interest to a community of users