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I have exactly the same concern with the proposed schema.org Identifier as with the bibframe Identifier. If <http://bowker.com/identifiers/isbn/9780553479430> is an identifier for a resource X, and <http://www.worldcat.org/oclc/38264520> is also an identifier the same resource X, and <http://bowker.com/identifiers/isbn/9780553479430> is a schema:Identifier, and <http://www.worldcat.org/oclc/38264520> is a schema:Book, then resource X is both a schema:Book and a schema:Identifier at the same time. Which is clearly nonsense. Basically ... don't do that. Please. Rob On Fri, Jul 11, 2014 at 11:16 AM, Mark K. Ehlert <[log in to unmask]> wrote: > Young,Jeff (OR) <[log in to unmask]> wrote: > >> >> >> UmljaGFyZCB3cm90ZSB1cCB0aGUgaHR0cHM6Ly93d3cudzMub3JnL2NvbW11bml0eS9zY2hlbWFi >> >> aWJleC93aWtpL0lkZW50aWZpZXIsIGJ1dCBJIGRvbid0IHJlbWVtYmVyIG11Y2ggZGlzY3Vzc2lv... >> > > > For those who can't read Jeff's response, here it is: > > Richard wrote up the >> https://www.w3.org/community/schemabibex/wiki/Identifier, but I don't >> remember much discussion of it. >> >> The abandoned "info" URI effort leaves me skeptical that non-HTTP URIs >> can be systematically described in general. I'm also skeptical that >> individual identifiers of any kind need to be described inline with >> instance data. >> >> http://info-uri.info/ >> >> Jeff >> > > > -- > Mark K. Ehlert Minitex > Coordinator University of Minnesota > Digitization, Cataloging & 15 Andersen Library > Metadata Education (DCME) 222 21st Avenue South > Phone: 612-624-0805 Minneapolis, MN 55455-0439 > <http://www.minitex.umn.edu/> > -- Rob Sanderson Technology Collaboration Facilitator Digital Library Systems and Services Stanford, CA 94305