This document specifies Pairtree, a filesystem hierarchy for holding objects that are located within that
hierarchy by mapping identifier strings to object directory (or folder) paths two characters at a time. If
an object directory (folder) holds all the files, and nothing but the files, that comprise the object, a
"pairtree" can be imported by a system that knows nothing about the nature or structure of the
objects but can still deliver any object's files by requested identifier.