The International Standard Book Number, ISBN, is a widely used
identifier for monographic publications. Since 2001, the URN
(Uniform Resource Name) namespace "ISBN" has been reserved for ISBNs.
The namespace registration was performed in RFC 3187 and applied only
to the ISBN as specified in the ISO Standard 2108-1992, now known as
"ISBN-10". To allow for further growth in use, the successor ISO
Standard, ISO 2108:2005, has defined an expanded format for the ISBN,
known as "ISBN-13". This document defines how both of these ISBN
standard versions can be supported within the URN framework.
Moreover, additional query and fragment usage related information
required by RFC 2141bis has been included. An updated namespace
registration conformant to RFC 3406bis is provided. It describes how
both the old and the new ISBN format can share the same namespace.
This document replaces RFC 3187; it also obsoletes and moves to
Historic status the predecessor thereof, RFC 2288.