Syntax items

Syntax diagrams contain many different items. Syntax items include:

Keywords - a command name or any other literal information.
Variables - variables are italicized, appear in lowercase and represent the name of values you can supply.
Delimiters - delimiters indicate the start or end of keywords, variables, or operators. For example, a left parenthesis is a delimiter.
Operators - operators include add (+), subtract (-), multiply (*), divide (/), equal (=), and other mathematical operations that may need to be performed.
Fragment references - a part of a syntax diagram, separated from the diagram to show greater detail.
Separators - a separator separates keywords, variables or operators. For example, a comma (,) is a separator.

Keywords, variables, and operators may be displayed as required, optional, or default. Fragments, separators, and delimiters may be displayed as required or optional.

Item type: Definition
Required: Required items are displayed on the main path of the horizontal line.
Optional: Optional items are displayed below the main path of the horizontal line.
Default: Default items are displayed above the main path of the horizontal line.