Url.PathSourcePrint the "kind-" prefix used to disambiguate urls in "flat modes": e.g. latex labels and output files in --flat HTML and man output
val split :
is_dir:(kind -> [ `Always | `Never | `IfNotLast ]) ->
(kind * string) list ->
(kind * string) list * (kind * string) listsplit is_dir path splits the list path into a directory and filename, based on the is_dir function. The function is_dir should return whether or not the path element kind should be a directory or not. If the function is_dir returns `IfNotLast then the element will be a directory only if it is not the last element in the path. The return value is a tuple of directory-type elements and filename-type elements. If the is_dir function can return `Always, the caller must be prepared to handle the case where the filename part is empty.