G.2 Reading Syntax Diagrams
All syntax diagrams in this book (configuration statements, console commands and utilities) use a com-
mon structure as described in the following table.
Symbol
Description
Êʬ¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬
This symbol indicates the beginning of a
syntax diagram.
¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬ÊÍ
This symbol indicates the end of a syntax
diagram.
¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬Ê
This symbol indicates that the syntax
diagram is continued on the next line.
ʬ¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬
This symbol indicates that the syntax
diagram is a continuation from the pre-
vious line.
¬¬¬¬¬¬¬¬¬¬ required element ¬¬¬¬¬¬¬¬¬¬¬
A required element (keyword or variable)
appears on the main path of the hori-
zontal line. You must specify this ele-
ment.
¬¬¬¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬§¬¬¬¬¬
An optional element (keyword or vari-
able) appears below the main path of the
horizontal line. You may or may not
specify this element.
¬¬¬¬¬§¬¬¬¬ required choice 1 ¬¬¬¬§¬¬¬¬¬
choice 2 ¬¬¬¬«
choice
A required choice (keyword or variable)
appears vertically stacked in the main
path of the horizontal line. You must
choose one of the available options.
¬¬¬¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬§¬¬¬¬¬
choice 2 ¬¬¬¬«
choice
An optional choice (keyword or variable)
appears vertically stacked below the
main path of the horizontal line. You may
choose one of the available options.