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Operators ..................................115
Parentheses and Operator Precedence .......................118
Clauses and Instructions .............................120
Null Clauses .................................120
Labels ...................................120
Instructions .................................120
Assignments .................................120
Keyword Instructions ..............................120
Commands .................................120
Assignments and Symbols.............................121
Constant Symbols...............................121
Simple Symbols ...............................122
Compound Symbols ..............................122
Stems ...................................123
Commands to External Environments ........................124
Environment .................................124
Commands .................................124
Basic Structure of REXX Running Under CICS .....................125
REXX Exec Invocation .............................125
Where Execs Execute .............................126
Locating and Loading Execs ...........................126
Editing Execs ................................126
REXX File System ..............................127
Control of Exec Execution Search Order ......................127
Adding User Written Commands .........................127
Support of Standard REXX Features .........................127
SAY and TRACE Statements...........................127
PULL and PARSE EXTERNAL Statements......................127
REXX Stack Support..............................127
REXX Function Support ............................127
REXX Command Environment Support ........................128
Adding REXX Host Command Environments .....................128
Support of Standard CICS Features/Facilities......................128
CICS Mapped I/O Support............................128
Dataset I/O Services ..............................128
Interfaces to CICS Facilities and Services ......................128
Issuing User Applications From Execs .......................128
REXX Interfaces to CICS Storage Queues......................128
Pseudo-conversational Transaction Support .....................129
Interfaces to Other Programming Languages ......................129
DBCS Support ................................129
Miscellaneous Features.............................129
Chapter 13. Keyword Instructions .........................131
ADDRESS ..................................132
ARG.....................................134
CALL ....................................135
DO.....................................138
DROP ....................................142
EXIT.....................................143
IF......................................144
INTERPRET ..................................145
ITERATE ...................................147
LEAVE....................................148
NOP.....................................149
NUMERIC...................................150
vi CICS TS for VSE/ESA: REXX Guide