[1] XRI Resolution 2.0 ( 版) <http://docs.oasis-open.org/xri/2.0/specs/xri-resolution-V2.0.html>
[2] RFC 2169 - A Trivial Convention for using HTTP in URN Resolution () <https://tools.ietf.org/html/rfc2169#page-7>
[3] RFC 2483 - URI Resolution Services Necessary for URN Resolution () <https://tools.ietf.org/html/rfc2483#section-5>