19 Filenames  19.2 Pathnames 19.2.2 Interpreting Pathname Component Values 19.2.2.2 Special Pathname Component Values
19.2.2.2.2 :WILD as a Component ValueIf :wild is the value of a pathname component, that component is considered to be a wildcard, which matches anything.A conforming program must be prepared to encounter a value of :wild as the value of any pathname component, or as an element of a list that is the value of the directory component. When constructing a pathname, a conforming program may use :wild as the value of any or all of the directory, name, type, or version component, but must not use :wild as the value of the host, or device component. If :wild is used as the value of the directory component in the construction of a pathname, the effect is equivalent to specifying the list (:absolute :wild-inferiors), or the same as (:absolute :wild) in a file system that does not support :wild-inferiors.
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