o2 5

Ch 5 Object Identity as a Query-Language Primitive

1 Introduction

5x. - The Structural Part - The Operational Part - Expressive Power - Type Inheritance - Value-based versus Object-Based - Relation to O2

2 An Object-based Data Model

5x. - 3 The Identity Query Language - Syntax - Semantics - Shorthands and Examples - 4 IQL Expressibility - 5 The Sublanguages of IQL - 6 Type Inheritance - 7 A Value-based Data Model - 8 Acknowledgements References