[1] RFC 5050 - Bundle Protocol Specification ( (2010-09-26 05:17:42 +09:00 版)) http://tools.ietf.org/html/rfc5050#section-4.4
[2] RFC 5050 - Bundle Protocol Specification (2015-06-21 13:26:12 +09:00 版) https://tools.ietf.org/html/rfc5050
o The "dtn" scheme, which is used at minimum in the representationof the null endpoint ID "dtn:none". The forwarding of a bundle tothe null endpoint is never contraindicated, and the minimumreception group for the null endpoint is the empty set.
o The "dtn" scheme, which is used at minimum in the representation
of the null endpoint ID "dtn:none". The forwarding of a bundle to
the null endpoint is never contraindicated, and the minimum
reception group for the null endpoint is the empty set.