pathname
Summary: The presentation type that represents a pathname.
The options are default-version , which defaults to :newest , default-type , which defaults to nil , and merge-default , which defaults to t . If merge-default is nil , accept returns the exact pathname that was entered; otherwise, accept merges against the default and default-version . If no default is supplied, it defaults to *default-pathname-defaults* . pathname has a default preprocessor that merges the options into the default.
Common Lisp Interface Manager 2.0 User's Guide - 3 Mar 2015