Review comment (Page 37): Using plus sign (+) instead of colon (:) might not be a good idea, since in HTTP protocols, space character is usually encoded as plus sign. REST interfaces typically used in machine to machine communication use HTTP protocol.
The conversion is done according to the pairtree specification: ttps://tools.ietf.org/html/draft-kunze-pairtree-01 (see section 3: “Identifier string cleaning”)
Review comment (Page 37): Using plus sign (+) instead of colon (:) might not be a good idea, since in HTTP protocols, space character is usually encoded as plus sign. REST interfaces typically used in machine to machine communication use HTTP protocol.