Appendix B. Notation

none Syntax

Name ::= ...

Defines a grammar rule with name Name.

none Syntax

Rule1 | Rule2

Alternative: either Rule1 or Rule2.

none Syntax

Rule*

Zero or more occurrences of Rule.

none Syntax

Rule+

One or more occurrences of Rule.

none Syntax

Rule?

Zero or one occurrences of Rule.

none Syntax

'xyz'

An occurrence of xyz with proper tokenization. For example, 'case' does not match cases.