Throughout this book, syntax is described using the structure defined as follows:
The >>--- symbol indicates the beginning of a statement.
The ---> symbol indicates that the statement syntax is continued on the next line.
The >--- symbol indicates that a statement is continued from the previous line.
The -->< symbol indicates the end of a statement.
>>-required item-----------------------------------------------><
>>-+---------------+------------------------------------------->< '-optional item-'
If you must choose one of the items, one item of the stack appears on the main path.
>>-+-required choice1-+---------------------------------------->< '-required choice2-'
If choosing none of the items is an option, the entire stack appears below the main path.
>>-+------------------+---------------------------------------->< +-optional choice1-+ '-optional choice2-'
A repeat arrow above a stack indicates that you can make more than one choice from the stacked items.
.----------------------. V | >>---+------------------+-+------------------------------------>< +-optional choice1-+ '-optional choice2-'