In the Author's Edition and the Author's Help files there is a topic

HOW TO READ A SYNTAX DIAGRAM

I see some syntax diagrams that I can't understand using the above explanation. 
So I seek enlightment.

CASE 1: According to HOW TO READ A SYNTAX DIAGRAM:

When you can select an item or take none, the choices are stacked  below  the 
main path.
>>——COMMAND——+——————————+——————————————————————————————————————————————————><
               +—argument—+
               +—KEYWORD——+
A default is shown above the main path. +—DEFault——+
  >>——COMMAND——+——————————+——————————————————————————————————————————————————><
               +—argument—+
               +—KEYWORD——+
The following diagram shows a default value (COMMIT) but does not show 
+——————————————————+ below the default to indicate item is optional

 +———————————————————————————————————————————————————————————————————————————+
  |                                                                           |
  |          <—————————————————————+                                          |
  |           +—COMMIT————————————+|                                          |
  | >>——SQL———+—RELEASE———————————++——+—+ select-statement +——+————————————>< |
  |           +—NOCOMMIT——————————+   +—+ insert-statement +——+               |
  |           +—REPEATable————————+   +—+ connect-statement +—+               |
  |           +—INDicators————————+   +—EXECUTE——+————————+———+               |
  |           +—NOINDicators——————+              +—string—+                   |
  |           |                (1)|                                           |
  |           +—PGMOWNER——word————+                                           |
  |           |                (2)|                                           |
  |           +—SUBSYSid——word————+                                           |
  |           |            (2)    |                                           |
  |           +—PLAN——word————————+                                           |

The only difference I see is that SQL has a repeat arrow; but that should make 
no difference
or if it does then shouldn't the HOW TO explain it?

CASE 2: Some diagrams include a character in the repeat arrow e.g. 
<————,————————+
This is not explained in the HOW TO.

I may send some other cases later. Thanks for your attention.

Bob Gailer

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