Symbols and Conventions

This document uses symbols and metasymbols to specify items in a general way. Symbols identify special items and behaviors. For example, keywords and metasymbols enclosed in square brackets are optional. The following is a complete list of symbols used in syntax:

Symbol	Description
<>	Indicates an item you supply, such as a variable name or literal value.
()	Within syntax specification, indicates function argument list. At the end of syntax specification, describes multiple behaviors.
[]	Indicates optional item or list.
{}	Indicates a code block or a literal array.
\|\|	Indicates a code block argument list.
-->	Indicates a function return value.
...	Repeated elements if followed by a symbol. Intervening code if followed by a keyword.
,	List item separator.
\|	Indicates two or more mutually exclusive options.
@	Indicates that an argument must be passed by reference.

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