Internet will rely on the Domain Name System as defined in RFCs 3401 3405. Each
namespace will have its own resolution mechanism, which is to be defined in the RFC in
which a namespace is registered to the identifier system. 
URN syntax has been defined in such a way that Web browsers could use them instead of
URLs. Unfortunately, at present the browsers support URNs only with the help of plug ins.
This has enabled URN implementation in various small environments (e.g., German
dissertations) that may or may not be interoperable with one another.   
For further information:
NID assignments: http://www.iana.org/assignments/urn namespaces
URN clearing house: http://www.uri.net/
13.4 ISAN and V ISAN
ISAN 
  International Standard Audiovisual Number
The ISAN identifies an audiovisual work 
 i.e., any work consisting of a moving image
with or without accompanying sound, and independent of the physical form in which that
work is distributed. The ISAN is not intended to be applied to still images, sound
recordings, or other forms of content without significant audiovisual components. The
assignment of an ISAN is not related to any process of copyright registration, nor does an
ISAN provide evidence of the ownership of rights in an audiovisual work. The ISAN makes
it possible for all rights holders (authors, producers, and their agents) to identify an
audiovisual work, independent of its physical form.
An ISAN consists of 16 hexadecimal digits divided into two segments: a 12 digit root
segment followed by a 4 digit segment for episodes.  Zeros are used as fill characters
when the work is not an episode. The prefix ISAN and a final check character are included
whenever an ISAN is presented in human readable form.  
Example:  ISAN 1881 66C7 3420 6541 9
The ISAN is an International Standard (ISO 15706:2002).  
The Registration Authority for ISAN is:
ISAN International Agency
26, rue de Saint Jean
CH 1203 Geneva
Switzerland
Tel: (+41) 22 545 10 00
Fax: (+41) 22 545 10 40
E mail: 
info@isan.org
URL: 
http://www.isan.org
V ISAN   
International Standard Audiovisual Number (ISAN)   Version identifier
A V ISAN identifies a specific version of an audiovisual work 
 or other content related to
an audiovisual work 
 throughout its life. A V ISAN is the combination of an International
Standard Audiovisual Number (ISAN), as defined in ISO 15706, with an appended version
segment.
The V ISAN is intended for use wherever precise and unique identification of a specific
version of an audiovisual work   or other content related to an audiovisual work   is
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