Conventions (ref)

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ENBF

We often use EBNF notation of our own.

<answers> ::=
    { '42' }

means that answers are a '42' repeated at least once.

<name> ::=
    'Douglas' [ 'Noel' ] 'Adams'

means that name is either Douglas Adams or Douglas Noel Adams. So the middle name is optional.

<character> ::=
    <arthur>
|   <ford>
|   <trillian>
|   <zephod>

means that character is any of the specified characters.

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