Directory Components in Non-Hierarchical File Systems (ANSI and GNU Common Lisp Document)

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#### 19.2.2.16 Directory Components in Non-Hierarchical File Systems

In non-hierarchical file systems, the only valid list values for the directory component of a pathname are `(:absolute string)` and `(:absolute :wild)`. `:relative` directories and the keywords `:wild-inferiors`, `:up`, and `:back` are not used in non-hierarchical file systems.