Syntax notation

Throughout this book, syntax descriptions use the structure defined below.

The following example shows how the syntax is used.

Format

   A                     B                C 

Read syntax diagramSkip visual syntax diagram                                   .-,------------.  
                                   V              |  
>>-+---------------+--INSTRUCTION----| fragment |-+------------><
   '-optional item-'                                 
 
fragment:
 
|--+-operand choice1------+-------------------------------------|
   |                 (1)  |  
   +-operand choice2------+  
   '-operand choice3------'  
 

Notes:
  1. operand choice2 and operand choice3 must not be specified together

 A 
The item is optional, and can be coded or not.
 B 
The INSTRUCTION key word must be specified and coded as shown.
 C 
The item referred to by "fragment" is a required operand. Allowable choices for this operand are given in the fragment of the syntax diagram shown below "fragment" at the bottom of the diagram. The operand can also be repeated. That is, more than one choice can be specified, with each choice separated by a comma.

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