Many systems that map generic relative paths to absolute paths do so with a
set of base paths.

For example, perl itself when loading classes first turn a 'Class::Name'
into a path like 'Class/Name.pm', and thens looks through each element of
'@INC' to find the actual file.

To aid in portability, all relative paths are provided as unix-style
relative paths, and converted to the localised version in the process of
looking up the path.