On 2 Jul 2015, at 14:49, John C Klensin wrote: > (3) I am now aware of three important efforts to establish a > standard for persistent identifiers for documents and data that > are available electronically or referenced electronically: the > semantic web's "entity registration system" (ERS), DOIs, and the > IETF's URNs. The three specs do not have the same scope, but > their scope overlaps significantly. There may well be others. I want to point out that in the early days of both DOI and URN there where significant discussions about whether/how DOI/Handles could be viewed from an IETF architecture perspective as a URN namespace. See for example <http://www.ietf.org/mail-archive/web/urn/current/msg01071.html> Patrik
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