Whitespace characters are spaces and newlines. Whitespace is used for improved readability and as necessary to separate tokens from each other, a token being an indivisible lexical unit such as an identifier or number, but is otherwise insignificant. Whitespace may occur between any two tokens, but not within a token. Whitespace may also occur inside a string, where it is significant. The comment continues to the end of the line on which the semicolon appears.
Comments are invisible to Scheme, but the end of the line is visible as whitespace.
Other notations For a description of the notations used for numbers, see section Numbers . A delimited plus or minus sign by itself is also an identifier. A delimited sequence of three successive periods is also an identifier. Go to the previous , next section.