4.1 Define the term entity and give an example other than those used in this book. 4.3 Explain the difference between an entity class and an entity instance. 4.4 Define the term attribute and give examples for the entity you described in question 4.1.

Think about what you'd want to see in an entity identifier, then write it down.

Match the term with its description by placing the letter of the definition in the space preceding the term. ✓ Attribute ✓ Entity ✓ Entity set ✓ One-to-many relationship ✓ Overlap constraint A. A property or description of an entity B. An association among two or more entities C. A collection of unique tuples D. An object in the real world that is distinguishable from other obje E. One entity can be associated with many of another entity F. Two or more subclasses can contain the same entity. G. A set of possible values for an attribute H.A collection of similar entities

13. What are the different types of relationship that can be established while constructing use case diagram? What is the conceptual difference between "include" and "extend" relationship in use case diagram? Explain.