The following rules apply to the syntax diagrams used in this book:
- Arrow symbols
- Read the syntax diagrams from left to right, from top to bottom, following
the path of the line.
- Conventions
- Variables appear in italics (for example, column-name). They
represent user-defined parameters or suboptions.
- When entering commands, separate parameters and keywords by at least one
blank if there is no intervening punctuation.
- Enter punctuation marks (slashes, commas, periods, parentheses, quotation
marks, equal signs) and numbers exactly as given.
- Footnotes are shown by a number in parentheses, for example, (1).
- A ␢ symbol indicates one blank position.
- Required items
- Required items appear on the horizontal line (the main path).

>>-REQUIRED-ITEM-----------------------------------------------><
- Optional items
- Optional items appear below the main path.

>>-REQUIRED-ITEM--+---------------+----------------------------><
'-optional-item-'
- Multiple required or optional items
- If you can choose from two or more items, they appear vertically in
a stack. If you must choose one of the items, one
item of the stack appears on the main path.

>>-+-required-choice1-+----------------------------------------><
'-required-choice2-'
If choosing one of the items is optional, the entire stack appears
below the main path.

>>-+------------------+----------------------------------------><
+-optional-choice1-+
'-optional-choice2-'
- Repeatable items
- An arrow returning to the left above the main line indicates that an
item can be repeated.

.-----------------.
V |
>>---repeatable-item-+-----------------------------------------><
If the repeat arrow contains a comma, you must separate repeated
items with a comma.

.-,---------------.
V |
>>---repeatable-item-+-----------------------------------------><
A repeat arrow above a stack indicates that you can specify more
than one of the choices in the stack.
- Default items
- IBM-supplied defaults appear above the main path, and the remaining
choices are shown below the main path. In the parameter list following the
syntax diagram, the default choices are underlined.

.-default-choice---.
>>-+------------------+----------------------------------------><
+-optional-choice1-+
'-optional-choice2-'