Dear all,
 
We would like to recommend the addition of "Uniform Resource 
Names (URN) to the proposal.
 
According to RFC 2396, URN is a subset of URI "The term 
"Uniform Resource Name" (URN) refers to the subset of URI 
that are required to remain globally unique and persistent 
even when the resource ceases to exist or becomes 
unavailable." and needs to be considered in the context of 
what a URI identifies.
 
Furthermore there are official registered URN namespaces. 
Further information are available at  
http://www.iana.org/assignments/urn-namespaces and 
http://www.uri.net/urn-nid-status.html. 

In this context We would like to refer to the European Library Office  
which also considered URNs within the metadata scheme 
http://www.dlib.org/dlib/february04/vanveen/02vanveen.html.

In the following some examples for the integration of URNs 
will be given. 

1st Example:
 
We would like to suggest instead of 
 
"Example formal identification systems include the Uniform 
Resource Identifier (URI) (including the Uniform Resource 
Locator (URL) ), the Digital Object Identifier (DOI) and the 
International Standard Book Number (ISBN)."
  
to formulate as follows
 
"Example formal identification systems include the Uniform 
Resource Identifier (URI) (including the Uniform Resource 
Locator (URL) and the Uniform Resource Name (URN)), the 
Digital Object Identifier (DOI) and the International 
Standard Book Number (ISBN)."

 
2nd Example:

Instead of 
 
"It may identify a location or service because any type of 
resource (including a location or service) can be identified 
by a URI (including a URL) and described by a DC metadata 
description. However, it is not an inherent property of a URL 
that it identifies a location or service." 
 
We would suggest 
 
"It may identify a location or service because any type of 
resource (including a location or service) can be identified 
by a URI (including a URL, URN) and described by a DC 
metadata description. However, it is not an inherent property 
of a URL that it identifies a location or service." 
 
 
3rd Example:
 
The proposal provides the following formulation
 
"Recommended best practice is to identify the resource by 
means of a string or number conforming to a formal 
identification system. Example formal identification systems 
include the Uniform Resource Identifier (URI) (including the 
Uniform Resource Locator (URL)), the Digital Object 
Identifier (DOI) and the International Standard Book Number (ISBN)."
 
We would recommend 
 
"Recommended best practice is to identify the resource by 
means of a string or number conforming to a formal 
identification system. Example formal identification systems 
include the Uniform Resource Identifier (URI) (including the 
Uniform Resource Locator (URL), Uniform Resource Name (URN)), 
the Digital Object Identifier (DOI) and the International 
Standard Book Number (ISBN)."
 
Best regards,
Kathrin Schroeder (Enhancement of Persistent Identifier Services -
Comprehensive Method for unequivocal Resource Identification (EPICUR),
Information Technology Department) 
Christine Frodl (Office for Library Standards) 
_______________________________

Christine Frodl
Die Deutsche Bibliothek
Deutsche Bibliothek Frankfurt am Main
Arbeitsstelle für Standardisierung
Adickesallee 1
D-60322 Frankfurt am Main
Telefon: +49-69-1525-1404
Telefax: +49-69-1525-1010
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