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<expression> --> <variable>
| <literal>
| <procedure call>
| <lambda expression>
| <conditional>
| <assignment>
| <derived expression>
| <macro use>
| <macro block>
<literal> --> <quotation> | <self-evaluating>
<self-evaluating> --> <boolean> | <number>
| <character> | <string>
<quotation> --> '<datum> | (quote <datum>)
<procedure call> --> (<operator> <operand>*)
<operator> --> <expression>
<operand> --> <expression>
<lambda expression> --> (lambda <formals> <body>)
<formals> --> (<variable>*) | <variable>
| (<variable>+ . <variable>)
<body> --> <definition>* <sequence>
<sequence> --> <command>* <expression>
<command> --> <expression>
<conditional> --> (if <test> <consequent> <alternate>)
<test> --> <expression>
<consequent> --> <expression>
<alternate> --> <expression> | <empty>
<assignment> --> (set! <variable> <expression>)
<derived expression> -->
(cond <cond clause>+)
| (cond <cond clause>* (else <sequence>))
| (case <expression>
<case clause>+)
| (case <expression>
<case clause>*
(else <sequence>))
| (and <test>*)
| (or <test>*)
| (let (<binding spec>*) <body>)
| (let <variable> (<binding spec>*) <body>)
| (let* (<binding spec>*) <body>)
| (letrec (<binding spec>*) <body>)
| (begin <sequence>)
| (do (<iteration spec>*)
(<test> <do result>)
<command>*)
| (delay <expression>)
| <quasiquotation>
<cond clause> --> (<test> <sequence>)
| (<test>)
| (<test> => <recipient>)
<recipient> --> <expression>
<case clause> --> ((<datum>*) <sequence>)
<binding spec> --> (<variable> <expression>)
<iteration spec> --> (<variable> <init> <step>)
| (<variable> <init>)
<init> --> <expression>
<step> --> <expression>
<do result> --> <sequence> | <empty>
<macro use> --> (<keyword> <datum>*)
<keyword> --> <identifier>
<macro block> -->
(let-syntax (<syntax spec>*) <body>)
| (letrec-syntax (<syntax spec>*) <body>)
<syntax spec> --> (<keyword> <transformer spec>)