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Common Lisp the Language, 2nd Edition
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A stream is a source or sink of data, typically characters or bytes.
Nearly all functions that perform I/O do so with respect to a specified
stream. The function open takes a pathname and returns a
stream connected to the file specified by the pathname. There are a
number of standard streams that are used by default for various
purposes. See chapter 21.
X3J13 voted in January 1989 (STREAM-ACCESS) to introduce subtypes of
type stream: broadcast-stream,
concatenated-stream, echo-stream,
synonym-stream, string-stream,
file-stream, and two-way-stream are disjoint
subtypes of stream. Note particularly that a synonym stream
is always and only of type synonym-stream, regardless of
the type of the stream for which it is a synonym.
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