pathspec—a logical pathname, a logical pathname namestring, or a stream.
logical-pathname—a logical pathname.
logical-pathname converts pathspec to a
logical pathname and returns the new logical pathname.
If pathspec is a logical pathname namestring,
it should contain a host component and its following colon.
If pathspec is a stream, it should be one
pathname returns a logical pathname.
If pathspec is a stream, the stream can be either open or closed.
logical-pathname returns the same logical pathname after a
file is closed as it did when the file was open.
It is an error if pathspec is a stream that is
Signals an error of type
type-error if pathspec isn't supplied correctly.
logical-pathname (System Class), translate-logical-pathname, Section 19.3 (Logical Pathnames)