The following rules apply to the syntax diagrams used in this book:
Diagrams of syntactical units other than complete statements start with the >--- symbol and end with the --->
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If an optional item appears above the main path, that item has no effect on the execution of the statement and is used only for readability.
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If choosing one of the items is optional, the entire stack appears below the main path.
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If the repeat arrow contains a comma, you must separate repeated items with a comma.
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A repeat arrow above a stack indicates that you can specify more than one of the choices in the stack.
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