www.delorie.com/gnu/docs/guile/r5rs_72.html

search

	Buy GNU books!

Revised(5) Scheme

7.1 Formal syntax

7.1.1 Lexical structure
7.1.2 External representations
7.1.3 Expressions
7.1.4 Quasiquotations
7.1.5 Transformers
7.1.6 Programs and definitions

This section provides a formal syntax for Scheme written in an extended BNF.

All spaces in the grammar are for legibility. Case is insignificant; for example, `#x1A' and `#X1a' are equivalent. <empty> stands for the empty string.

The following extensions to BNF are used to make the description more concise: <thing>* means zero or more occurrences of <thing>; and <thing>+ means at least one <thing>.