Open Location Code is a library to generate short codes, called "plus codes", that can be used as digital addresses where street addresses don't exist.
This comment seems to be based on a previous OLC format that did not use '+' but '.' as separator character which also was optional. Will rephrase this after #455 has been accepted.
https://github.com/google/open-location-code/blob/a323e80159d6d6170158cc22497250cb86bf3583/python/openlocationcode/openlocationcode.py#L383-L408
This comment seems to be based on a previous OLC format that did not use '+' but '.' as separator character which also was optional. Will rephrase this after #455 has been accepted.