Section 4 of the draft <https://tools.ietf.org/html/draft-chen-rdns-urn-06#section-4> documents why a URN is better than URL as a namespace. While a URL is globally unique, a URL is also a resource locator, providing access information. For an enterprise that does not wish to publish the access information of its YANG models, a URN is a better choice.
As required by RFC 3406, Section 3 of the draft, at the bottom of page 5 <https://tools.ietf.org/html/draft-chen-rdns-urn-06#page-5> under "Identifier Persistence Considerations", addresses the question of identifier persistence. The main concern for "identifier persistence" is in the case where an identifier is used for global resolution. Because YANG model namespaces do not provide global resolutions (actually YANG model namespaces are only used to uniquely identify a model within a device), the identifier persistence consideration is not as crucial. (Please see RFC 3406 top of page 13 <https://tools.ietf.org/html/rfc3406#page-13> for the identifier persistence discussion.) Thanks, Helen > -----Original Message----- > From: Juergen Schoenwaelder [mailto:j.schoenwaelder@jacobs- > university.de] > Sent: Friday, April 15, 2016 11:23 AM > To: Ing-Wher (Helen) Chen <[email protected]> > Cc: [email protected] > Subject: Re: [netmod] update on "rdns" URN for enterprise YANG models > > Hi Helen, > > can you explain why > > urn:rdns:de:jacobs-university:foo > > is from a technical perspective significantly better than > > http://jacobs-university.de/foo > > also considering that domain names are not stable identifiers but subject to > changing ownerships or limited lifetimes (and hence a URN embedding > domain names has the same stability properties)? > > /js > > On Fri, Apr 15, 2016 at 02:59:30PM +0000, Ing-Wher (Helen) Chen wrote: > > Hello, > > > > At IETF94 in Yokohama, I presented an idea to allow enterprise YANG > > models to easily generate globally unique namespaces > > (https://datatracker.ietf.org/doc/draft-chen-netmod-enterprise-yang- > namespace/) . > > > > The topic was also discussed on the mailing list: > > > https://mailarchive.ietf.org/arch/msg/netmod/JQmD8yrUeuAwuHpBnqZV_ > mcuv > > eU > > > https://mailarchive.ietf.org/arch/msg/netmod/GSz_1dp2R3FPlMmu2_HF3ZI > wr > > sY > > https://mailarchive.ietf.org/arch/msg/netmod/tJDZPI9PV1- > SjZm2c608OQu41 > > ws > > > https://mailarchive.ietf.org/arch/msg/netmod/RCYhzKvMd0BATTtxaE69nbv > cj > > 7g > > > > As promised, I started the process of registering the top-level "rdns" > namespace. > > Following RFC 3406, I wrote > > https://datatracker.ietf.org/doc/draft-chen-rdns-urn/ > > and completed the review on [email protected] . For the review on > > [email protected] , please see the following messages. > > > > The final message stating the review is complete is here: > > https://mailarchive.ietf.org/arch/msg/urn-nid/-Dwx-2JBd- > eTA4ONNiwaJhUP > > mcs > > > > The review in its entirety is here: > > https://mailarchive.ietf.org/arch/msg/urn- > nid/N3Md2evqFPE2o7figeGcyqT4 > > BsY > > https://mailarchive.ietf.org/arch/msg/urn- > nid/wEIRTDvf4vPJPW9ORw6lkK6S > > t2A > > https://mailarchive.ietf.org/arch/msg/urn- > nid/btXpEnmt7LHL4ZeCUvxYLQPU > > ps4 > > https://mailarchive.ietf.org/arch/msg/urn-nid/52U72G2qzuqEwfSVIkD9YE- > P > > v3c > > https://mailarchive.ietf.org/arch/msg/urn- > nid/_AHANMEp_uq9ZFI7bHzf7lVv > > poM > > https://mailarchive.ietf.org/arch/msg/urn-nid/UgfKVlPS87x-1j2juHI8jLHd > > mAY > > https://mailarchive.ietf.org/arch/msg/urn-nid/fFjwJMup43- > P4mGQ4GMnG5Ds > > rdM > > https://mailarchive.ietf.org/arch/msg/urn-nid/sRpdhqpw- > t4t0A15svbM_eyw > > Gj8 > > https://mailarchive.ietf.org/arch/msg/urn-nid/pibno5XNyXvAhuJ9bW6lKJjD > > A0w > > https://mailarchive.ietf.org/arch/msg/urn-nid/-Dwx-2JBd- > eTA4ONNiwaJhUP > > mcs > > > > Thanks, > > Helen > > > > _______________________________________________ > > netmod mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/netmod > > -- > Juergen Schoenwaelder Jacobs University Bremen gGmbH > Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany > Fax: +49 421 200 3103 <http://www.jacobs-university.de/> _______________________________________________ netmod mailing list [email protected] https://www.ietf.org/mailman/listinfo/netmod
