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Revised(5) Scheme

7.1.2 External representations

<Datum> is what the read procedure (section see section 6.6.2 Input) successfully parses. Note that any string that parses as an <expression> will also parse as a <datum>.

<datum> --> <simple datum> | <compound datum> <simple datum> --> <boolean> | <number> | <character> | <string> | <symbol> <symbol> --> <identifier> <compound datum> --> <list> | <vector> <list> --> (<datum>*) | (<datum>+ . <datum>) | <abbreviation> <abbreviation> --> <abbrev prefix> <datum> <abbrev prefix> --> ' | ` | , | ,@ <vector> --> #(<datum>*)