ISO published ISO 27729 earlier this year, see http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=44292
The standard describes the ISNI - International Standard Name Identifier - "whose scope is the identification of Public Identities of parties: that is, the identities used publicly by parties involved throughout the media content industries in the creation, production, management, and content distribution chains." (Taken from http://www.isni.org/).
Does anyone a) have heard of it or b) has plans to use this?