1. Scope and Overviews
   1.1 Scope
   1.2 Referenced Publications
   1.3 Goals and Rationale
   1.4 An Informal Guide to the PL/I Definition
   1.5 Relationships between an Implementation and this
       Definition
   1.6 The Metalanguage
   1.7 Initialization of the Machine-state
2. Concrete Syntax
   2.1 Introduction
   2.2 The Intent of this Definition
   2.3 Organization of the Concrete Syntax
   2.4 The High-Level Syntax of PL/I
   2.5 The Low-level Syntax of PL/I
   2.6 Character Sets
   2.7 Abbreviations
3. Abstract Syntax
   3.1 Introduction
   3.2 Abstract Syntax Rules
4. The Translator
   4.1 Introduction
   4.2 Translate
   4.3 Forming the Translation Unit
   4.4 Validation of the Translation Unit
   4.5 Completion of the External Unit
   4.6 Create-abstract-equivalent-tree
   4.7 Validation of the External Unit
   4.8 Validate-program
5. The PL/I Interpreter
   5.1 Introduction
   5.2 The Interpretation-state
   5.3 Terminology and Definitions
   5.4 The Interpret Operation and Interpretation State
       Initialization
6. Flow of Control
   6.1 Introduction
   6.2 Program Activation and Termination
   6.3 Block Activation and Termination
   6.4 Control within a Block
   6.5 Conditions and Interrupts
7. Storage and Assignment
   7.1 Introduction
   7.2 The Generation
   7.3 The Allocation of Storage
   7.4 Initialization
   7.5 The Freeing of Storage
   7.6 Assignment
   7.7 Variable-reference
   7.8 Reference to Named Constant
8. Input/Output
   8.1 Introduction
   8.2 Datasets
   8.3 Files
   8.4 I/O Conditions
   8.5 Evaluate-file-option
   8.6 File Opening and Closing
   8.7 The Record I/O Statements
   8.8 The Stream I/O Statements
9. Expressions and Conversion
   9.1 Introduction
   9.2 Aggregate Expressions
   9.3 Prefix Operators
   9.4 Infix Operators
   9.5 Built-in Functions
   9.6 Conversion
Appendix A. Features New to This Revision Adopted from
            X3.53-1976
   A.1 Lexical Constructs
   A.2 Attributes and Declarations
   A.3 Program Structure and Control
   A.4 Storage Control
   A.5 Input/Output
   A.6 Expressions and Evaluation
   A.7 Pictures
   A.8 Built-in Functions and Pseudo-variables
   A.9 Conditions and Exception Handling
Appendix B. Features New to This Revision
   B.1 Lexical Constructs
   B.2 Attributes and Declarations
   B.3 Program Structure and Control
   B.4 Storage Control
   B.5 Input/Output
   B.6 Expressions and Evaluation
   B.7 Pictures
   B.8 Built-in Functions and Pseudo-variables
   B.9 Enquiries
   B.10 Conditions and Exception Handling
Appendix C. Clarifications and Restrictions from X3.74-1981
Appendix D. Features of X3.53-1976 not Adopted in This
            Standard
   D.1 Program Structure
   D.2 Program Control
   D.3 Storage Control Statements
   D.4 Input/Output
   D.5 Attributes and Pictures
   D.6 Built-in Functions and Pseudo-variables
   D.7 Expressions
   D.8 Change in Intermediate Results
Appendix E. Incompatible Changes from X3.74-1981
Appendix F. Rationale for Major Design Decisions
Index