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| ANSI Common Lisp 19 Filenames 19.1 Overview of Filenames ### 19.1.1 Namestrings as Filenames A namestring is a string that represents a filename. In general, the syntax of namestrings involves the use of implementation-defined conventions, usually those customary for the file system in which the named file resides. The only exception is the syntax of a logical pathname namestring, which is defined in this specification; see Section 19.3.1 Syntax of Logical Pathname Namestrings. A conforming program must never unconditionally use a literal namestring other than a logical pathname namestring because Common Lisp does not define any namestring syntax other than that for logical pathnames that would be guaranteed to be portable. However, a conforming program can, if it is careful, successfully manipulate user-supplied data which contains or refers to non-portable namestrings. A namestring can be coerced to a pathname by the functions pathname or parse-namestring.

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