From owner-urn-ietf@LISTS.NETSOL.COM  Wed Aug  1 10:12:19 2001
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Approved-By:  Juha Hakala <juha.hakala@HELSINKI.FI>
Message-ID:  <3B680A92.6D26C5C3@helsinki.fi>
Date:         Wed, 1 Aug 2001 16:56:34 +0300
Reply-To: Juha Hakala <juha.hakala@HELSINKI.FI>
From: Juha Hakala <juha.hakala@HELSINKI.FI>
Subject:      URN NID registration for SICI
To: URN-IETF@LISTS.NETSOL.COM

This is a multi-part message in MIME format.
--------------6FAA0FDB48845E0C79E6F4C7
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Dear Internet drafts editor and others,

Please find attached the first version of the URN Namespace ID
registration for Serial Item and Contribution Identifier, SICI (which is
the ANSI/NISO identifier for serial issues and articles). Although SICI
is not universally used like ISBN or ISSN, it is becoming more popular
in the Internet environment, where each serial article can be an
independent entity which can be accessed directly. This of course makes
identification on article level important. Identifying just the serial
is no longer sufficient.

The method proposed in the draft for resolving SICI-based URNs has been
implemented in experimental system built in co-operation by EU project
DIEPER and the ISSN International Centre. My colleagues in DIEPER and
staff in ISSN IC have given me very valuable support and guidance in
writing the draft.

The draft is attached in two versions: Word2000 and plain text with line
feeds.

Best regards,

Juha Hakala

PS. For your information: The IESG has approved the URN NID
registrations for ISBN and national bibliography numbers (NBNs). Thus
there are already quite a few registered URN namespaces, including key
systems - ISBN and ISSN - used by the publishers and libraries.
--

****************************************************
 Juha Hakala
 Helsinki University Library /
 Library Network Services
 tel +358 9 191 44293 fax +358 9 753 9514
 internet: juha.hakala@helsinki.fi
*****************************************************
--------------6FAA0FDB48845E0C79E6F4C7
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Network Working Group                                       Juha Hakala
Internet-Draft                              Helsinki University Library
Category: Informational                                   1 August 2001
draft-ietf-hakala-sici-00.txt
Expires: 1 February 2002





            Using Serial Item and Contribution Identifiers as
                         Uniform Resource Names

Status of this Memo

This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026.

Internet-Drafts are working documents of the Internet Engineering Task
Force (IETF), its areas, and its working groups. Note that other groups
may also distribute working documents as Internet-Drafts.

Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference material
or to cite them other than as "work in progress."

To view the entire list of Internet-Draft Shadow Directories, see
http://www.ietf.org/shadow.html.

This Internet-Draft will expire on 1 February 2002.

Abstract

This document discusses how Serial Item and Contribution Identifiers
(SICIs; persistent and unique identifiers for serial issues and
contributions such as articles) can be supported within the URN
framework and the syntax for URNs defined in RFC 2141 [Moats]. Much of
the discussion below is based on the ideas expressed in RFC 2288
[Lynch]. Chapter 5 contains a URN namespace registration request
modelled according to the template in RFC 2611 [Daigle et al.].


1. Introduction

As part of the validation process for the development of URNs the IETF
working group agreed that it is important to demonstrate that the
current URN syntax proposal can accommodate existing identifiers from
well-established namespaces.  One such infrastructure for assigning and
managing names comes from the bibliographic community.  Bibliographic
identifiers function as names for objects that exist both in print and,
increasingly, in electronic formats.  RFC 2288 [Lynch et. al.]
investigated the feasibility of using three identifiers (ISBN, ISSN and
SICI) as URNs.

SICI is an American national standard defined by NISO/ANSI Z39.56-1996
[NISO]. The need to develop a new version of the standard is at present
being investigated by NISO.

RFC 2288 does not - and it was not the aim of its authors - to analyse
how SICI-based URNs can actually be resolved. This text will specify one
solution to this question. There may be other, complementary resolution
services.

Generally, the difficulty of designing a URN resolution service is
dependent on two factors:

* Is the identifier dumb, or does it provide a hint on where to find a
resolution service?

* How many potential resolution services are there?

ISBN (International Standard Book Number) is a good example of an
intelligent identifier. Analysis of the ISBN will reveal not only the
region where the ISBN has been assigned, but also the publisher who is
responsible for the book. Resolution of ISBN-based URNs can be
decentralised to national bibliography databases, maintained by the
national libraries. If the ISBN was a dumb identifier, this would be
impossible.

International Standard Serial Number (ISSN) is a dumb identifier. It
does not have a publisher identifier; serials published by a certain
company get seemingly random ISSNs. Although ISSNs are allocated to
regional agencies in blocks, which gives the system some "intelligence",
a resolution service should not rely on these blocks, but use the global
ISSN database. It contains a bibliographic description of every
periodical that has received an ISSN. Thus, it is easy to resolve ISSN-
based URNs even though the identifier itself does not help in localising
the resolution service.

SICI is based on ISSN (see below for a description of its syntax). Like
ISSN, it is therefore a dumb identifier. But there is not, and will
never be, a global SICI database, which would contain bibliographic
information about every serial issue and/or article published in the
world. Most articles will not be catalogued at all, and the existing
bibliographic information about articles is dispersed into a large
number of databases maintained by publishers, libraries and other
information intermediaries. Although it might be technically possible to
merge records from these databases into a union catalogue, in practice
such an enterprise is not politically possible.

As a "dumb" identifier with a large and ever growing number of potential
resolution services SICI poses interesting challenges to the design of
the URN resolution process.

Generally, a combination of dumb identifier and multiple resolution
services is a problem, since there is no simple way of finding out which
resolution service is the correct one. A gateway service is needed for
providing this valuable information. Below we propose that for SICI-
based URNs, the global ISSN database will be capable of acting as a link
between the user and the resolution service.

The registration request for acquiring a Namespace Identifier (NID)
"SICI" for Serial Item and Contribution Identifiers has been written by
the National Library of Finland on behalf of the National Information
Standards Organization (NISO). The request is included in chapter 5 of
this text.

The document at hand is part of a global co-operation of the national
libraries to foster identification of electronic documents in general
and utilisation of URNs in particular. This work is co-ordinated by a
working group established by the Conference of Directors of National
Libraries (CDNL).

We have used the URN Namespace Identifier "SICI" for the Serial Item and
Contribution Identifiers in examples below.


2. Identification vs. Resolution

As a rule the SICIs identify finite, manageably-sized objects, but these
objects may still be large enough so that resolution to a hierarchical
system, such as all articles published in a serial issue, is
appropriate.

The materials identified by a SICI may exist only in printed or other
physical form, not electronically. The best that a resolver service will
be able to offer in this case is bibliographic data from the database
providing resolution services, including information about where the
physical resource is stored in the owner institution's holdings.


3. Serial Item and Contribution Identifier

3.1 Overview

The Serial Item and Contribution Identifier (SICI) standard defines a
variable length code that provides unique identification of serial items
(e.g., issues) and the contributions (e.g., articles) contained in a
serial title. SICI is specified in NISO/ANSI Z39.56-1996 [NISO2]. Like
other NISO standards, the SICI document is available for free in the Web.

SICI is based on ISSN (International Standard Serial Number), but
augments it extensively. SICI is a combination of three segments, all of
which are required:

Item segment; the data elements needed to describe the serial item such
as serial issue (ISSN, Chronology, Enumeration)

Contribution segment, the data elements needed to identify contributions
within an item (Location, Title Code)

Control segment, the data elements needed to record those administrative
elements that determine the validity, version, and format of the SICI
code representation.

RFC 2288 provides the following example:

   0015-6914(19960101)157:1<62:KTSW>2.0.TX;2-F

   The first nine characters are the ISSN identifying the serial title.
   The second component, in parentheses, is the chronology information
   giving the date the particular serial issue was published.  In this
   example that date was January 1, 1996.  The third component, 157:1,
   is enumeration information (volume, number) for the particular issue
   of the serial.  These three components comprise the "item segment" of
   a SICI code.  By augmenting the ISSN with the chronology and/or
   enumeration information, specific issues of the serial can be
   identified.  The next segment, <62:KTSW>, identifies a particular
   contribution within the issue.  In this example we provide the
   starting page number and a title code constructed from the initial
   characters of the title.  Identifiers assigned to a contribution can
   be used in the contribution segment if page numbers are
   inappropriate.  The rest of the identifier is the control segment,
   which includes a check character.  Interested readers are encouraged
   to consult the standard for an explanation of the fields in that
   segment.

SICI can be seen as a logical extension of the ISSN to the items and
individual contributions that make up a serial's hierarchical structure.
The current version of the SICI does have some limitations; it does not
allow identification of subsections of an article such as paragraphs or
diagrams. If deemed necessary, the functionality needed for article
subsection identification could be added to the standard.

The current version of SICI guarantees uniqueness in most situations;
however, the standard does not always differentiate between multiple
variant formats in which an electronic article may be published. For
instance, variants of a digitised article published in PDF and HTML
formats will receive the same SICI, provided that the ISSN is the same.

According to the rules of the ISSN centre, ISSN numbers can be applied
retrospectively to old periodicals. If the original printed document has
an ISSN, the same identifier is also valid for the digitised version.
ISSN guidelines formulate this principle in the following way:

A reproduction is a copy of an item and intended to function as a
substitute for that item. The reproduction may be in a different medium
from the original but it is not a different edition in itself. The ISSN
assigned to the original is valid for the reproduction, a new ISSN is not
assigned to the reproduction.

ISSN numbers are assigned by regional agencies, which receive ISSN
blocks from the ISSN International Centre. SICI usage is not dependent
on such formal agencies; the aim is that once ISSN is known, SICI codes
can be created, manually or by computer program, by publishers,
libraries, document delivery services or even by individual users.

Given the complexity of SICI codes, the recommended practice is to
automate the SICI creation process. If an article is structured enough,
all elements of SICI can be extracted from the document. A tool capable
of this has been built by the E.U. project DIEPER; this tool, of course,
only works properly if the document is structured in the way the DIEPER
project recommends. Another, less challenging option is a SICI
generator, which builds syntactically correct SICIs including the check
character if the basic ingredients are typed in manually.


3.2 Encoding Considerations and Lexical Equivalence

RFC 2288 contains the following simple and yet sufficient analysis of
SICI encoding:

   The character set for SICIs is intended to be email-transport-
   transparent, so it does not present major problems.  However, all
   printable excluded and reserved characters from the URN syntax are
   valid in the SICI character set and must be %-encoded.

   Example of a SICI for an issue of a journal:

          URN:SICI:1046-8188(199501)13:1%3C%3E1.0.TX;2-F

   For an article contained within that issue:

          URN:SICI:1046-8188(199501)13:1%3C69:FTTHBI%3E2.0.TX;2-4

   Equivalence rules for SICIs are not appropriate for definition as
   part of the namespace and incorporation in areas such as cache
   management algorithms.  It is best left to resolver systems which try
   to determine if two SICIs refer to the same content.  Consequently,
   we do not propose any specific rules for equivalence testing through
   lexical manipulation.


3.3 Resolution of SICI-based URNs

Since ISSN is a dumb code, SICI does not contain any explicit hint on
where to find the URN resolution service or services. However, an
efficient and global resolution service can be accomplished by using the
ISSN register as a way station. In spring 2001, the ISSN register
contained about one million bibliographic records describing serials,
including thousands of electronic journals. There are several other
databases, which contain hundreds of thousands of serial records, but
the ISSN register has the best coverage.

The first step in resolving a SICI-based URN is a query to the ISSN
register. The SICI resolution service in the ISSN register will parse
the SICI code in order to extract the ISSN from it.

ISSN will then be used as a search key for retrieving the bibliographic
record of the serial from the ISSN register.

Currently the ISSN register already contains thousands of records
describing electronic journals. These records contain the URL of the
serial's home page.

This URL is appropriate for resolving the URN based on the ISSN of the
periodical. The mechanism for resolving such URNs via the ISSN register
has been specified in RFC 3044 [Rozenfeld]. The ISSN International
Centre has already built a demonstration URN resolution service for
ISSN-based URNs into their present information system.

In order to resolve SICI-based URNs, a new data element has to be added
into the records in the ISSN register. This data element would contain
the network address (URL) of the database, which holds the article
required and/or bibliographic information about it. It must also be
possible to specify volumes and if necessary issues which are included
in the database within this data element. The data element should be
repeatable, since the same article may be available from multiple
sources. For instance, the publisher, Library of Congress
(http://www.loc.gov/), JSTOR (http://www.jstor.org/) and a number of
host services such as EBSCO (http://www.ebsco.com/home/) may all have a
copy of the same resource.

The SICI resolution service built into the ISSN register will check if
database address information is available in the bibliographic record of
the serial. Then it makes sure that the volume and/or issue needed is
available via the service. If this is the case, the application will
make the query, receive the result - article or bibliographic
information about it - and pass it on to the user.

The functionality described above was implemented in co-operation
between the ISSN International Centre and the E.U. project DIEPER
(http://gdz.sub.uni-goettingen.de/dieper/). The SICI resolution service
is an extension of the service built for resolving ISSN-based URNs. By
March 2001 a demonstrator service via which several of the databases
maintained by the project partners could be accessed was released for
internal use within the project. The ISSN IC and project partners wish
to maintain the service also after the formal end of the project.

Discussions about adding the new data element into bibliographic records
in the ISSN register are under way.

Please note that the discussion herein applies to SICIs assigned to
serial contributions. Since serial items (issues) have seldom been
described or digitised as such, a search by serial item SICI will in
practice be expanded into retrieval of all contributions (articles)
within the serial item (issue) in question.

If a resolution service for the resource at hand does not exist, or the
user is not authorised to utilise it, he/she may get the bibliographic
description of the serial from the ISSN register.


3.4 Additional considerations

Electronic journals have rapidly become very popular in scientific
publishing. The main reasons for this are the emergence of viable
business models (e.g. licensing) and the birth of a reliable and
efficient delivery mechanism (the Web).

New content is being added via two different channels. A significant
number of scientific journals is published in electronic form, usually
alongside a printed version. On the other hand, old printed volumes are
digitised and made available in electronic form. Digitisation is done by
development projects such as DIEPER, established services such as JSTOR,
or publishers - for instance Elsevier is digitising all printed journals
the company has published.

Reliable linking of articles to references and bibliographic data about
the articles is an important issue. URLs are as of this writing the most
common means used for linking, but their reliability is low; average
lifetime for a URL is estimated to be two years.

A more reliable linking mechanism than URLs is urgently needed.
Commercial publishers are already using Digital Object Identifiers
(DOI). As a commercial system DOI is not ideal for materials, which do
not have a commercial potential any more (or yet). For such material the
added value services planned into the DOI infrastructure would also be
of limited value.

URN is a non-commercial and technically advanced alternative for DOI
resolution services. Due to the co-operation of the ISSN International
Centre the service is truly global, and can accommodate an unlimited
number of services located anywhere in the world.

For instance, in order to establish URN-based links to articles
digitised in JSTOR service, a number of steps are necessary. First, each
article must be identified by SICI, and these SICIs must be indexed in
the JSTOR database. Second, bibliographic records of JSTOR journals in
the ISSN register must all be enriched with a link to the JSTOR search
interface and volume/issue information. For instance, the bibliographic
record describing the journal "Ecology" must contain the information
that volumes 1-77 (1920-1996) are available via JSTOR. This information
may be quite volatile, and maintenance of the ISSN register must
therefore be frequent and efficient.

Apart from modification of the data, some programming work is needed.
Due to the work done in the DIEPER project, the ISSN register already
has the functionality needed for resolving SICI-based URNs. Adding the
required functionality into the JSTOR database may or may not be
difficult depending on the system architecture; in DIEPER some partners
were able to implement the required functionality quite easily.

Since the Web browsers do not support URN resolution yet, the final step
in enabling resolution of URN-based SICIs is installation of the browser
plug-in developed by the ISSN International Centre.

For various reasons, one article may be available in several locations.
Every article copy may have a different set of users who are allowed
access to it. For instance, a copy acquired by a national library via
legal deposit may only be available within the library premises.

Making the links context sensitive - provide only those links that
"work" for a user is a challenge. OpenURL framework [Van de Sompel]
provides a means for sensitive linking. As of this writing OpenURL is
rapidly gaining popularity, and there are already a few integrated
library systems which support it. The ISSN register may in the future
support OpenURL usage; this would be very valuable when the same
resource (article) is available from several sources, which have
different user population.

In their present form the URN resolution services provided via the ISSN
register suit those services best, which are available in public domain,
and are reasonably stable. Numerous digitisation projects such as DIEPER
are currently making printed articles available in the Web in digital
form.

An additional benefit of coding the needed location and volume
information into the ISSN register would be that this database then
could also serve as a global registry of serial digitisation efforts.
Such a register is badly needed to avoid duplicate work.

Since the number of SICI resolution services will eventually be high,
the capacity of the server on which the ISSN register runs and its
network connection may become a bottleneck, especially if the articles
were delivered via the ISSN server to the users. Setting up mirror sites
would in this case be the most efficient means for load control and
balancing. Technically the setting up of mirror sites is not difficult.
The ISSN register contains approximately a million bibliographic
records, and is therefore not a very large database.


4. Security Considerations

This document proposes means of encoding and using Serial Item and
Contribution Identifiers within the URN framework. This document does
not discuss resolution except at a generic level; thus questions of
secure or authenticated resolution mechanisms in the ISSN register or in
actual resolution services are out of scope.  This text does not address
means of validating the integrity or authenticating the source or
provenance of URNs that contain SICIs.  Issues regarding intellectual
property rights associated with objects identified by the various
bibliographic identifiers are also beyond the scope of this document, as
are questions about rights to the databases that might be used to
construct resolvers.


5. Namespace registration

URN Namespace ID Registration for the Serial Item and Contribution
Identifier (SICI)

Namespace ID:

SICI

SICI is a well-established acronym for Serial Item and Contribution
Identifiers; giving this NID for any other system would cause a lot of
confusion.

This namespace ID has already been used in SICI-based URNs in the E.U.
project DIEPER.

Registration Information:

Version: 1
Date: 2001-08-01


Declared registrant of the namespace:

Name: Patricia Harris
E-mail: pharris@niso.org
Affiliation: National Information Standards Organisation
Address: 4733 Bethesda Avenue, Suite 300, Bethesda, MD 20814

Declaration of syntactic structure:

Each SICI contains three segments:

Item segment; the data elements needed to describe the serial item such
as serial issue (ISSN, Chronology, Enumeration)

Contribution segment, the data elements needed to identify contributions
within an item (Location, Title Code)

Control segment, the data elements needed to record those administrative
elements that determine the validity, version, and format of the SICI
code representation.

Example:

   0015-6914(19960101)157:1<62:KTSW>2.0.TX;2-F

SICI codes can be generated and parsed by computer programs.


Relevant ancillary documentation:

SICI is an American national standard defined by NISO/ANSI Z39.56-1996
[NISO2]. A new version of the standard is currently under development.


Identifier uniqueness considerations:

SICI codes will almost always be unique. Since SICI is based on ISSN,
articles from different journals will definitely never get the same
SICI. Since enumeration and chronology information must also be given,
articles and other contributions published in different volumes and
issues will also never get the same SICI.

SICIs may not be unique if and only if:

If two or more contributions are published on the same page(s) and if
they have similar enough titles (the first letter of each word is the
same).

In a single issue of an electronic journal (which lacks page numbers)
there are two or more contributions with titles similar enough.

If there are several technical variants of an electronic serial
contribution (multiple formats, multiple resolutions) the current
version of SICI will not make any difference between these variants. In
this case the intellectual content will usually be the same, but layout
will differ from one version to another.

The new version of the SICI standard will be enhanced in order to
diminish the risk of non-unique SICIs.


Identifier persistence considerations:

Once assigned, SICI will never change. The same SICI will not be used
again for other serial items and contributions.

Process of identifier assignment:

There will not be a national, regional or international agency governing
the SICI assignment process. Publishers, libraries or other information
intermediaries will create SICIs when needed. The most important
prerequisite is that the journal must have an ISSN.

Although SICI assignment is decentralised, the national ISSN agencies
and the ISSN International Centre may support publishers and other
interested parties in SICI implementation.

SICI can - and should - be built via automated means. If the source
document such as article is sufficiently structured, SICI can be
generated without human involvement. Another option is a semi-automated
process, in which a human user types in the relevant data elements, and
the application takes care of building the code.

Process for identifier resolution:

Resolution will take place in two steps as defined in chapter 3.3. First
the ISSN register is used for finding the location of the resolution
service(s) for the serial and volume at hand. Using the linking
information stored in the serial's bibliographic record, the correct
resolution service is contacted, and the requested resource is delivered
to the user.


Rules for Lexical Equivalence:

We do not propose any specific rules for equivalence testing through
lexical manipulation.


Conformance with URN Syntax:

According to the RFC 2288:

The character set for SICIs is intended to be email-transport-
transparent, so it does not present major problems.  However, all
printable excluded and reserved characters from the URN syntax are
valid in the SICI character set and must be %-encoded.

Example of a SICI for an issue of a journal:

     URN:SICI:1046-8188(199501)13:1%3C%3E1.0.TX;2-F

For an article contained within that issue:

     URN:SICI:1046-8188(199501)13:1%3C69:FTTHBI%3E2.0.TX;2-4


Validation mechanism:

Validity of a SICI string can be checked by modulus 37 check digit.


Scope:

Global.


6. References

[Daigle et al.]: Daigle, L., van Gulik, D., Iannella, R. & Faltstrom,
P.: URN Namespace Definition Mechanisms, RFC2611, June 1999.

[Lynch] Lynch, C., Using Existing Bibliographic Identifiers as Uniform
Resource Names, RFC 2288, February 1998

[Moats] Moats, R., URN Syntax, RFC 2141, May 1997.

[NISO] NISO/ANSI Z39.56-1996 Serial Item and Contribution Identifier.
Electronic resource, available at http://www.techstreet.com/cgi-
bin/pdf/free/152629/z39-56.pdf

[Rozenfeld] Rozenfeld, S., Using The ISSN (International Serial Standard
Number) as URN (Uniform Resource Names) within an ISSN-URN Namespace,
RFC 3044, January 2001.

[Van de Sompel] Van de Sompel, Herbert & Beit-Arie, Oren: Open Linking
in the Scholarly Information Environment Using the OpenURL Framework. D-
Lib Magazine, March 2001. Electronic resource, available at
http://www.dlib.org/dlib/march01/vandesompel/03vandesompel.html


7. Authors' Address

   Juha Hakala
   Helsinki University Library - The National Library of Finland
   P.O. Box 26
   FIN-00014 Helsinki University
   FINLAND

   E-mail: juha.hakala@helsinki.fi


8.  Full Copyright Statement

   Copyright (C) The Internet Society (2001).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.




--------------6FAA0FDB48845E0C79E6F4C7--


From owner-urn-ietf@LISTS.NETSOL.COM  Wed Aug  1 12:20:06 2001
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Message-ID:  <3B682AA2.836774C@rs8.loc.gov>
Date:         Wed, 1 Aug 2001 12:13:23 -0400
Reply-To: rden@LOC.GOV
From: Ray Denenberg <rden@LOC.GOV>
Organization: Library of Congress
Subject:      Re: URN NID registration for SICI
To: URN-IETF@LISTS.NETSOL.COM
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There used to be an informal but very informative page about both registered and
pending URN NID assignments, at:
http://www.isi.edu/in-notes/iana/assignments/urn-namespaces.

Now this page has been removed and instead points to:
http://www.iana.org/assignments/urn-namespaces

and it lists only the registered namespaces, not the pending ones.  Is there somewhere
now that lists pending requests and their statuses?

Juha notes that NBN and ISBN have been approved. Neither is listed,  and I notice that
the page was last updated only a few days ago.


--

Juha Hakala wrote:


> .......

> PS. For your information: The IESG has approved the URN NID
> registrations for ISBN and national bibliography numbers (NBNs). Thus
> there are already quite a few registered URN namespaces, including key
> systems - ISBN and ISSN - used by the publishers and libraries.

--
Ray Denenberg
Library of Congress
rden@loc.gov
202-707-5795


From owner-urn-ietf@LISTS.NETSOL.COM  Wed Aug  1 12:58:33 2001
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Reply-To: Michael Mealling <michael@research.netsol.com>
From: Michael Mealling <michael@research.netsol.com>
Subject:      Re: URN NID registration for SICI
To: URN-IETF@LISTS.NETSOL.COM
In-Reply-To:  <3B682AA2.836774C@rs8.loc.gov>; from rden@loc.gov on Wed, Aug 01,
              2001 at 12:13:23PM -0400

On Wed, Aug 01, 2001 at 12:13:23PM -0400, Ray Denenberg wrote:
> There used to be an informal but very informative page about both registered
> and pending URN NID assignments, at:
> http://www.isi.edu/in-notes/iana/assignments/urn-namespaces.
>
> Now this page has been removed and instead points to:
> http://www.iana.org/assignments/urn-namespaces
>
> and it lists only the registered namespaces, not the pending ones.  Is
> there somewhere now that lists pending requests and their statuses?
>
> Juha notes that NBN and ISBN have been approved. Neither is listed,  and I
> notice that the page was last updated only a few days ago.

I think you are talking about this page:
http://www.uri.net/urn-nid-status.html
which is an informal list that I maintain so I can keep up on the process...

and I show both documents are sitting with the RFC Editor which means
the IESG has approved them and they're goin through the publication process.

The RFC Editors queue page has them both in the EDIT state. EDIT state
means "approved by IESG, awaiting processing and publishing".

Getting nosy, I poked around in ftp://ftp.isi.edu/in-notes/authors to see
what was pending (i.e. in AUTHORS 48 HOURS) and the only URN related
doc was Norman's "A URN Namespace for Public Identifiers" (which I just
updated the entry for on my page. Congrats John, Norm and Paul!)

-MM

--
--------------------------------------------------------------------------------
Michael Mealling                       | mailto:michael@research.netsol.com
Advanced Naming Research Manager       | go:Michael Mealling
Verisign Applied Research              | urn:pin:1


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Reply-To: Larry Masinter <LMM@ACM.ORG>
From: Larry Masinter <LMM@ACM.ORG>
Subject:      durls and tibs: dated URLs as URNs
To: URN-IETF@LISTS.NETSOL.COM
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This still needs some work, but since it's been bouncing around
as a meme for 3 years, I thought I would try writing it down.

It's probably a bad idea, but if so maybe you can help me figure
out why. (Is this the right list? uri@w3.org?)



===============

INTERNET-DRAFT                                         Larry Masinter
draft-masinter-dated-url-00a.txt                       August 8, 2001
Expires February 2002


                 Two URN Namespaces based on dated URLs

Status of this Memo

This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026.

Internet-Drafts are working documents of the Internet Engineering Task
Force (IETF), its areas, and its working groups.  Note that other
groups may also distribute working documents as Internet-Drafts.

Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time.  It is inappropriate to use Internet- Drafts as reference
material or to cite them other than as "work in progress."

The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt.

The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.

This document is not a product of any working group, but may be
discussed on the mailing list <urn-ietf@lists.netsol.com>.


Abstract

This document defines a persistent namespace of URNs based on
prepending a date to an encoded URL. The result is a namespace that is
as easy to obtain as a URL, but which offers total persistance.

1. Introduction

Many people have wondered about how to create persistent identifiers
without registration. Some people have noted that cool URLs shouldn't
change. However, it isn't a good idea to design systems on the
assumption that other bits of design are uniformly implemented.

URLs are unique across all space, but not across all time. Domain
names can change, as can other pieces of identifying information.
Normally, library citations include date of publication so that the
context of the naming can be determined.

The first kind of URN takes the form:

     urn:durl:<date>:<encoded-URL>

where 'durl' means 'dated URL'; <date> is a digit string corresponding
to a date (and possibly time), and an <encoded-URL> is a URL where
every "/" and "%" is encoded in hex (as %2f and %25 respectively).
The meaning of a durl is "the resource that was identified by the
<encoded-URL> (after hex decoding) at the very first instant of the
date given".

For example, urn:durl:2001:http:%2f%2flarry.masinter.net is a
persistent identifier to 'http://larry.masinter.net' as of the very
first moment of the year 2001. Note that a durl isn't a resource
locator in any practical sense, because the time of location has
passed. However, is an acceptable resource identifier, and fulfills
all of the requirements for URNs.

The second kind of URN is a parallel space.  Many uses for URIs are
for objects or concepts that are not actually networked resources. For
this purpose, a second namespace is defined which designates the
"thing identified by" the resource at the given URL at the given
date. This URN namespace is described by 'tib', e.g.,

        urn:tib:<date>:<encoded-URL>

So urn:durl:2001:http:%%2f%2fwww.ietf.org can be used to designate the
Internet Engineering Task Force organization, at least as it was
constituted at the first instant of 2001.

2. "durl" URN Specification Template

  Namespace ID:
      "durl" requested.

  Registration Information:

      Registration Version: 1
      Registration Date: 2001-08-08


  Declared registrant of the namespace:
      Larry Masinter, <durl:2001:mailto:lmm@acm.org>

  Declaration of syntactic structure:


3. Dates

 A <date> is a date in the syntax of a subset of RFC 2550;
   date = year [ month [ day [ hour [ minute [ second [ fraction ]]]]]]
   year     = 4digit
   month    = 2digit
   day      = 2digit
   hour     = 2digit
   minute   = 2digit
   second   = 2digit
   fraction = *digit

   All dates and times MUST be relative to International Atomic Time
   (TAI) [NRAO].

4. Good practice

The meaning of a 'durl' is:

The resource that was (or will be) located by the given
URL at the very first instant of the given date and time.
For this purpose (as with RFC 2550), a date precedes every
other date for which it is a prefix.

Using dates in the future, before web servers were available
makes no sense and shouldn't be done.

Using URLs that weren't resolvable at the given time
isn't a good idea.

5. Community COnsiderations

The assignment of identifiers in the 'durl' and 'tib' namespaces are
completely open; anyone who can assign any sort of URI can assign
such a URN.

There are no accurate resolution servers for URNs in these namespaces;
however, the principles of operation are simple. 'tib' URNs are not
intended to be resolvable (ever), although resolution of the
corresponding 'durl' would give a resource that would indicate the
identity of the actual resource it identifies. Resolvers for 'durl'
identifiers with dates in the past require some archiving
service. Internet archives may be managed by anyone, and there are a
number of search engines that maintain some set of archives.

Clients without access to any resolution service can take the
decoded <encoded-URL> of a durl and attempt resolution of *that*
identifier. This will give an approximation whose reliability
depends to some degree on the amount of time elapsed.

6. IANA considerations

This document includes a URN NID registration that should
be entered into the IANA registry of URN NIDs.


7. Security Considerations

URLs don't contain enough information to supply the
authority for deciding what was or wasn't at a given
URL at a given date.


8. Acknowledgements

Many thanks to the many discussions on the relationship of URLs, URNs,
URIs and resource identifiers, as well as similar ideas, that have
been floated over the last many years.

9. Copyright

Copyright (C) The Internet Society, 1997. All Rights Reserved.

This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph
are included on all such copies and derivative works.  However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other
than English.

The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.

This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE."


10. Author's addresses

          Larry Masinter
          Adobe Systems Incorporated
          345 Park Ave
          San Jose, CA 95110
          mailto: LMM@acm.org
          http://larry.masinter.net
          Tel: +1 408 536-3024


11. References

[RFC 2141] R. Moats, "URN Syntax", May 1997.


From owner-urn-ietf@LISTS.NETSOL.COM  Wed Aug  8 20:34:25 2001
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From: Phillip Hallam-Baker <hallam@ai.mit.edu>
Subject:      Re: durls and tibs: dated URLs as URNs
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I would like the tib to simply be a date, dns address and an opaque string.
I don't want to have to specify a protocol prefix to identify a thing that
is not going to be accesible by protocol.

If there has to be a URL involved we will still have the problem of people
insisting on being told the semantics of derefferencing the URL which is
precisely what I don't want anyone to be able to do.

I would like to be a bit more specific about the party that makes the
authoritative statement about the binding of the identifier. Since DNS names
have unique owners at given points in time, or at least are capable of being
bound to unique machines it should be possible to be a bit more specific.
This would help on the legal side.


Instead of tib I would prefer ddi for dated DNS identifier. 'Thing
identified' looks like an attempt to not use the words 'object' or
'resource'.

Also there are a couple of typos, urn:durl:2001:http:%2f%2f should be
urn:durl:2001:http%2e%2f%2f and urn:durl:2001:http:%%2f%2fwww.ietf.org
should be urn:durl:2001:http%2e%2f%2fwww.ietf.org [or the text is wrong]



I also have a need to be able to identify hierarchy within the identifier
for my applications (XKMS, XTASS, SAML) so that I can make assertions about
sets of related things.

<...>
   <Declare First="urn:ddi:xtass.xmltrustcenter.org/200108082202/AAAAEGIE"
                Last="urn:ddi:xtass.xmltrustcenter.org/200108082202/AAAAFEAB"
                Status="Valid" Terminal="True">

States that the assertions with identifiers in the specified interval are
Valid.


<...>
   <Declare Match="urn:ddi:xtass.xmldistrustcenter.org/*"
                Status="Invalid" Terminal="True">

States that all assertions issued by the distrust center are Invalid.

[BTW First, Last and Match ar of type string, not uriReference since they
specify a restricted regular expression that defines an interval of URIs.
Wildcards are only permitted at the end of the expression, the match is
segmented across the hierarchical boundaries]


With the tib and durl schemes I can't take advantage of any syntactic
similarity to group identifiers which in my application is a non-negotiable
requirement.


        Phill

> -----Original Message-----
> From: Larry Masinter [mailto:LMM@acm.org]
> Sent: Wednesday, August 08, 2001 7:01 PM
> To: URN-IETF@lists.netsol.com
> Subject: durls and tibs: dated URLs as URNs
>
>
> This still needs some work, but since it's been bouncing around
> as a meme for 3 years, I thought I would try writing it down.
>
> It's probably a bad idea, but if so maybe you can help me figure
> out why. (Is this the right list? uri@w3.org?)
>
>
>
> ===============
>
> INTERNET-DRAFT                                         Larry Masinter
> draft-masinter-dated-url-00a.txt                       August 8, 2001
> Expires February 2002
>
>
>                  Two URN Namespaces based on dated URLs
>
> Status of this Memo
>
> This document is an Internet-Draft and is in full conformance with all
> provisions of Section 10 of RFC2026.
>
> Internet-Drafts are working documents of the Internet Engineering Task
> Force (IETF), its areas, and its working groups.  Note that other
> groups may also distribute working documents as Internet-Drafts.
>
> Internet-Drafts are draft documents valid for a maximum of six months
> and may be updated, replaced, or obsoleted by other documents at any
> time.  It is inappropriate to use Internet- Drafts as reference
> material or to cite them other than as "work in progress."
>
> The list of current Internet-Drafts can be accessed at
> http://www.ietf.org/ietf/1id-abstracts.txt.
>
> The list of Internet-Draft Shadow Directories can be accessed at
> http://www.ietf.org/shadow.html.
>
> This document is not a product of any working group, but may be
> discussed on the mailing list <urn-ietf@lists.netsol.com>.
>
>
> Abstract
>
> This document defines a persistent namespace of URNs based on
> prepending a date to an encoded URL. The result is a namespace that is
> as easy to obtain as a URL, but which offers total persistance.
>
> 1. Introduction
>
> Many people have wondered about how to create persistent identifiers
> without registration. Some people have noted that cool URLs shouldn't
> change. However, it isn't a good idea to design systems on the
> assumption that other bits of design are uniformly implemented.
>
> URLs are unique across all space, but not across all time. Domain
> names can change, as can other pieces of identifying information.
> Normally, library citations include date of publication so that the
> context of the naming can be determined.
>
> The first kind of URN takes the form:
>
>      urn:durl:<date>:<encoded-URL>
>
> where 'durl' means 'dated URL'; <date> is a digit string corresponding
> to a date (and possibly time), and an <encoded-URL> is a URL where
> every "/" and "%" is encoded in hex (as %2f and %25 respectively).
> The meaning of a durl is "the resource that was identified by the
> <encoded-URL> (after hex decoding) at the very first instant of the
> date given".
>
> For example, urn:durl:2001:http:%2f%2flarry.masinter.net is a
> persistent identifier to 'http://larry.masinter.net' as of the very
> first moment of the year 2001. Note that a durl isn't a resource
> locator in any practical sense, because the time of location has
> passed. However, is an acceptable resource identifier, and fulfills
> all of the requirements for URNs.
>
> The second kind of URN is a parallel space.  Many uses for URIs are
> for objects or concepts that are not actually networked resources. For
> this purpose, a second namespace is defined which designates the
> "thing identified by" the resource at the given URL at the given
> date. This URN namespace is described by 'tib', e.g.,
>
>         urn:tib:<date>:<encoded-URL>
>
> So urn:durl:2001:http:%%2f%2fwww.ietf.org can be used to designate the
> Internet Engineering Task Force organization, at least as it was
> constituted at the first instant of 2001.
>
> 2. "durl" URN Specification Template
>
>   Namespace ID:
>       "durl" requested.
>
>   Registration Information:
>
>       Registration Version: 1
>       Registration Date: 2001-08-08
>
>
>   Declared registrant of the namespace:
>       Larry Masinter, <durl:2001:mailto:lmm@acm.org>
>
>   Declaration of syntactic structure:
>
>
> 3. Dates
>
>  A <date> is a date in the syntax of a subset of RFC 2550;
>    date = year [ month [ day [ hour [ minute [ second [
> fraction ]]]]]]
>    year     = 4digit
>    month    = 2digit
>    day      = 2digit
>    hour     = 2digit
>    minute   = 2digit
>    second   = 2digit
>    fraction = *digit
>
>    All dates and times MUST be relative to International Atomic Time
>    (TAI) [NRAO].
>
> 4. Good practice
>
> The meaning of a 'durl' is:
>
> The resource that was (or will be) located by the given
> URL at the very first instant of the given date and time.
> For this purpose (as with RFC 2550), a date precedes every
> other date for which it is a prefix.
>
> Using dates in the future, before web servers were available
> makes no sense and shouldn't be done.
>
> Using URLs that weren't resolvable at the given time
> isn't a good idea.
>
> 5. Community COnsiderations
>
> The assignment of identifiers in the 'durl' and 'tib' namespaces are
> completely open; anyone who can assign any sort of URI can assign
> such a URN.
>
> There are no accurate resolution servers for URNs in these namespaces;
> however, the principles of operation are simple. 'tib' URNs are not
> intended to be resolvable (ever), although resolution of the
> corresponding 'durl' would give a resource that would indicate the
> identity of the actual resource it identifies. Resolvers for 'durl'
> identifiers with dates in the past require some archiving
> service. Internet archives may be managed by anyone, and there are a
> number of search engines that maintain some set of archives.
>
> Clients without access to any resolution service can take the
> decoded <encoded-URL> of a durl and attempt resolution of *that*
> identifier. This will give an approximation whose reliability
> depends to some degree on the amount of time elapsed.
>
> 6. IANA considerations
>
> This document includes a URN NID registration that should
> be entered into the IANA registry of URN NIDs.
>
>
> 7. Security Considerations
>
> URLs don't contain enough information to supply the
> authority for deciding what was or wasn't at a given
> URL at a given date.
>
>
> 8. Acknowledgements
>
> Many thanks to the many discussions on the relationship of URLs, URNs,
> URIs and resource identifiers, as well as similar ideas, that have
> been floated over the last many years.
>
> 9. Copyright
>
> Copyright (C) The Internet Society, 1997. All Rights Reserved.
>
> This document and translations of it may be copied and furnished to
> others, and derivative works that comment on or otherwise explain it
> or assist in its implementation may be prepared, copied, published
> and distributed, in whole or in part, without restriction of any
> kind, provided that the above copyright notice and this paragraph
> are included on all such copies and derivative works.  However, this
> document itself may not be modified in any way, such as by removing
> the copyright notice or references to the Internet Society or other
> Internet organizations, except as needed for the purpose of
> developing Internet standards in which case the procedures for
> copyrights defined in the Internet Standards process must be
> followed, or as required to translate it into languages other
> than English.
>
> The limited permissions granted above are perpetual and will not be
> revoked by the Internet Society or its successors or assigns.
>
> This document and the information contained herein is provided on an
> "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
> TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
> BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
> HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
> MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE."
>
>
> 10. Author's addresses
>
>           Larry Masinter
>           Adobe Systems Incorporated
>           345 Park Ave
>           San Jose, CA 95110
>           mailto: LMM@acm.org
>           http://larry.masinter.net
>           Tel: +1 408 536-3024
>
>
> 11. References
>
> [RFC 2141] R. Moats, "URN Syntax", May 1997.
>


From owner-urn-ietf@LISTS.NETSOL.COM  Thu Aug  9 08:35:00 2001
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From: Larry Masinter <LMM@ACM.ORG>
Subject:      Re: durls and tibs: dated URLs as URNs
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> I would like the tib to simply be a date, dns address and an opaque string.

I'm uncomfortable with making references that never were or will be
resolvable. In the case of 'tib', resolution is a matter of intent (which
I intend to elaborate in the next revision); the thing identified by a tib
is to be interpreted in the context of the intent of the corresponding
URL at the corresponding moment.

So urn:tib:2001:data:,the%20president%20of%20the%20United%20States could
refer to George Bush. It is "resolvable" in the sense that it is possible
to make a good guess about what the tib refers to. It may be uncertain,
but it isn't unambiguous.

If you only supply date, DNS and string, though, there can
be disagreements because there is no constraint about assignment.
You and I could both claim to assign completely different
semantics to the date "20010809", dns name "ietf.org" and
string "wonderful name space" and there would be no way to
differentiate these ever. There's no particular advantage
to those bits of data over just using random strings.

> I don't want to have to specify a protocol prefix to
> identify a thing that is not going to be accessible by protocol.

The protocol prefix is an essential part of the resolution
mechanism for both durl and tibs, albeit the resolution is
only reliably available with a time machine.

> If there has to be a URL involved we will still have the problem of people
> insisting on being told the semantics of derefferencing the URL which is
> precisely what I don't want anyone to be able to do.

I'm not sure why you want to insist on crippling people's
ability to ever know what you mean. In the case of durls and tibs,
the semantics of dereferencing the URL is clear; it accesses
now the resource that WAS the target (or description/identifier
of the target) at the given date.

> I would like to be a bit more specific about the party that makes the
> authoritative statement about the binding of the identifier. Since DNS names
> have unique owners at given points in time, or at least are capable of being
> bound to unique machines it should be possible to be a bit more specific.
> This would help on the legal side.

I'm uncomfortable with the assertion that DNS names have unique
owners at any given point in time; there are many cases of DNS
name disputes, DNS names whose listed owners are service providers
many steps removed from the actual location of intent.

The URI system is much more flexible than DNS, in that it allows
the kind of source of authority to migrate from DNS name to any other
kind of URI scheme.

(I'm going to avoid discussing the 'legal' side because of all of
the differing interpretations of intent in various jurisdictions.)

> Instead of tib I would prefer ddi for dated DNS identifier. 'Thing
> identified' looks like an attempt to not use the words 'object' or
> 'resource'.

I think it's clear that we're solving different problems; I think
I'm a little clearer about what problem I'm solving (creating
a system of resource identifiers that have clear semantics that
do not change over time). I also think that durls and tibs might
be more useful in the context of RDF expressions and other uses
which want to replace ASN.1 OIDs with URIs but cannot find appropriate
URIs to use.

> Also there are a couple of typos, urn:durl:2001:http:%2f%2f should be
> urn:durl:2001:http%2e%2f%2f and urn:durl:2001:http:%%2f%2fwww.ietf.org
> should be urn:durl:2001:http%2e%2f%2fwww.ietf.org [or the text is wrong]

There is no need to escape the ":" in the URI. As far as URN syntax
goes, I confess that it is a stretch to say that the date is the naming
authority and the URL scheme is a delegated authority, but I don't think
that model is out of the question. On the other hand, URNs don't allow
"/" (although it might be useful).

I did make a mistake in the text, in not being explicit that all of
the <excluded> characters of URNs (section 2 of RFC 2141) which occur
within the referenced URL should all be escaped in the encoded-URL.

> I also have a need to be able to identify hierarchy within the identifier
> for my applications (XKMS, XTASS, SAML) so that I can make assertions about
> sets of related things.

Well, RFC 2141 is clear that URNs do not admit hierarchy. If
you'd really solved the problems with hierarchy and URNs then
one might consider trying to update RFC 2141, but I think that
there are problems with your intended use of hierarchy (below).

> <...>
>    <Declare First="urn:ddi:xtass.xmltrustcenter.org/200108082202/AAAAEGIE"
>               Last="urn:ddi:xtass.xmltrustcenter.org/200108082202/AAAAFEAB"
>               Status="Valid" Terminal="True">
>
> States that the assertions with identifiers in the specified interval are
> Valid.

You've gone substantially beyond hierarchies to also assume a
sorting order. I suppose this is OK, although you'll have to
be clearer.

> <...>
>    <Declare Match="urn:ddi:xtass.xmldistrustcenter.org/*"
>               Status="Invalid" Terminal="True">
>
> States that all assertions issued by the distrust center are Invalid.

You have an implicit universal quantifier, but you haven't stated
the scope. "All assertions" over what time period? Are statements
associated with that domain name in the year 2235 also invalid?
My impression is that most of these kind of assertions and inferences
based on them are valid only if there is a context that clearly
bounds the context, but the main power of URIs are that they retain
meaning when moved from one context to another.

> With the tib and durl schemes I can't take advantage of any syntactic
> similarity to group identifiers which in my application is a non-negotiable
> requirement.

I agree that durls and tibs don't satisfy your requirements.
On the other hand,
(a) there are requirements that durls and tibs satisfy that
   ddis do not.
(b) I'm not sure the (implicit) requirements you've placed on
  ddis can be satisfied, e.g., that they can be used with regular
  expressions to make universally quantified assertions about
  sets of resources.


Larry
--
http://larry.masinter.net


From owner-urn-ietf@LISTS.NETSOL.COM  Thu Aug  9 10:46:50 2001
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> If you only supply date, DNS and string, though, there can
> be disagreements because there is no constraint about assignment.

I very much doubt that people would be using unstable domain
names for the purposes I am anticipating.


> You and I could both claim to assign completely different
> semantics to the date "20010809", dns name "ietf.org" and
> string "wonderful name space" and there would be no way to
> differentiate these ever. There's no particular advantage
> to those bits of data over just using random strings.

But a court can resolve the issue with little difficulty.
The owner of the domain name www.citibank.com is not going
to be in much dispute.

The rule book of the exchange and membership agreements are
going to address the issue in any case.

Furthermore the courts will have less difficulty resolving
my proposal after the fact than yours.


> The protocol prefix is an essential part of the resolution
> mechanism for both durl and tibs, albeit the resolution is
> only reliably available with a time machine.

Quite.


> > If there has to be a URL involved we will still have the
> problem of people
> > insisting on being told the semantics of derefferencing the
> URL which is
> > precisely what I don't want anyone to be able to do.
>
> I'm not sure why you want to insist on crippling people's
> ability to ever know what you mean.

Because these are names and not locators. The meaning arises
from the usage.


> > Also there are a couple of typos, urn:durl:2001:http:%2f%2f
> should be
> > urn:durl:2001:http%2e%2f%2f and
> urn:durl:2001:http:%%2f%2fwww.ietf.org
> > should be urn:durl:2001:http%2e%2f%2fwww.ietf.org [or the
> text is wrong]
>
> There is no need to escape the ":" in the URI. As far as URN syntax
> goes, I confess that it is a stretch to say that the date is
> the naming
> authority and the URL scheme is a delegated authority, but I
> don't think
> that model is out of the question. On the other hand, URNs don't allow
> "/" (although it might be useful).

The text says to escape the colon. The double %% is wrong in any
case.


> Well, RFC 2141 is clear that URNs do not admit hierarchy. If
> you'd really solved the problems with hierarchy and URNs then
> one might consider trying to update RFC 2141, but I think that
> there are problems with your intended use of hierarchy (below).

The only 'problems' were people. There is no ambiguity. The intention
was to prevent people doing entirely resonable things with the
identifiers.

If you have slashes they indicate a hierarchical structure. If that
causes problems for your scheme don't use them.

The statement in 2141 is a SHOULD NOT, the rationale is ideological.
The authors admit that they don't think they understand the reasoning,
so let them give way to folk who can.

I'll bet that nobody can state one bad thing that would happen if
the words SHOULD NOT were replaced by MAY. Other than the fact that
people could use fragments for the intended use.

Even in your intended application the ideology breaks your
use. If I have a page http://www.cnn.com/index then your construction
would be urn:durl:2001:http:%2f%2fwww.cnn.com%2findex
this would break all the internal links to no purpose.

If you object 'well the semantics of the links are captured', this
looks to me to be a reasonable thing to expect to happen if you give
a document two different identifiers.

If I have an identifier for the document on the date then it is
reasonable to also demand that relative URIs refer to the respective
documents on the respective dates.


If you want a cannonical form for the durl of a document then
specify a time interval rather than an instant. The time interval
would be the time the document was first published to the time when
it was replaced.


The ideological attempt to prevent URLs containing hierarchy has simply
caused that function to be transfered from the slash to the colon.

What I am considering doing is rewriting the XTASS draft to stipulate
that if you have a URN scheme you consider colons to be segment
identifiers in recgonition of this 'achievement'.

> You've gone substantially beyond hierarchies to also assume a
> sorting order. I suppose this is OK, although you'll have to
> be clearer.

The paper is explicit on the point, the post is merely descriptive.


> > <...>
> >    <Declare Match="urn:ddi:xtass.xmldistrustcenter.org/*"
> >               Status="Invalid" Terminal="True">
> >
> > States that all assertions issued by the distrust center
> are Invalid.
>
> You have an implicit universal quantifier, but you haven't stated
> the scope. "All assertions" over what time period? Are statements
> associated with that domain name in the year 2235 also invalid?

No, because the assertion itself has a validity interval.


> My impression is that most of these kind of assertions and inferences
> based on them are valid only if there is a context that clearly
> bounds the context, but the main power of URIs are that they retain
> meaning when moved from one context to another.

Its a Wittgenstein type name, the meaning is defined by the use.
There is no meaning outside the context.


                Phill


From owner-urn-ietf@LISTS.NETSOL.COM  Fri Aug 17 23:02:38 2001
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Date:         Fri, 17 Aug 2001 14:29:41 -0700
Reply-To: Larry Masinter <LMM@ACM.ORG>
From: Larry Masinter <LMM@ACM.ORG>
Subject:      Re: durls and tibs: dated URLs as URNs
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I don't think there was closure on the discussion about
durls and tibs. I've been struggling to make a better
case for my discomfort with the common notion of using
a URN as an unbounded abstract "name" where the only
source of authority is "the owner of the domain name
at the time of assignment".

Let's suppose we had a "host" URL scheme:
  host:<dns-name>[ <path> ]

and then
  tib:<date>:host:<dns-name>[ <path> ]

would be the way that you could have a tib with the properties
you wanted.
>
> I would like the tib to simply be a date, dns address and an opaque string.
> I don't want to have to specify a protocol prefix to identify a thing that
> is not going to be accesible by protocol.
>
> If there has to be a URL involved we will still have the problem of people
> insisting on being told the semantics of derefferencing the URL which is
> precisely what I don't want anyone to be able to do.

I've gone back and forth about renaming "tib" to "tdb": "thing described
by", that is, dereferencing the URL in a tib does give you something, it
gives you the description of the concept identified.

Now, getting the description in some unspecified format (HTML, text,
someone who might answer email) isn't actually useful in protocol
implementation, but it is useful in determining semantics.


> I would like to be a bit more specific about the party that makes the
> authoritative statement about the binding of the identifier. Since DNS names
> have unique owners at given points in time, or at least are capable of being
> bound to unique machines it should be possible to be a bit more specific.
> This would help on the legal side.

With tib/tdb, you don't need to get into the world of individuals
and responsibility, community web sites that are mantained by groups,
etc. DNS names don't really have "owners"; there's some registration
process that's managed by a domain administrator in many cases, but
it's often hard to decide "who". So I'd rather avoid all of that and
come up with an extrinsic reference rather than an intrinsic one,
"tdb" is a reader-relative reference rather than a writer-relative
reference.

> Instead of tib I would prefer ddi for dated DNS identifier. 'Thing
> identified' looks like an attempt to not use the words 'object' or
> 'resource'.

Well, "tib" and "tdb" were somewhat tongue-in-cheek. I kind of like
durl since it's short. Dated URL-based Identifier, "durlbi".


From owner-urn-ietf@LISTS.NETSOL.COM  Tue Aug 21 09:46:28 2001
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Reply-To: Michael Mealling <michaelm@neonym.net>
From: Michael Mealling <michaelm@neonym.net>
Subject:      an extension/update to the 'ietf' NID...
To: URN-IETF@LISTS.NETSOL.COM

Hi all,
  Some of you may have seen a draft from me a while back that was
for the 'iana' URN NID. I've since updated it and moved it under the
already existing 'ietf' NID as an extension. While this isn't really
a huge issue for the URN Working Group, it is the first time we've
had an 'update' to an existing namespace. I am looking for feedback
on how this new extension works for internal IETF standards usage.

See http://www.ietf.org/internet-drafts/draft-mealling-iana-urn-01.txt

-MM

--
--------------------------------------------------------------------------------
Michael Mealling        |      Vote Libertarian!       | urn:pin:1
michael@neonym.net      |                              | http://www.neonym.net


From owner-urn-ietf@LISTS.NETSOL.COM  Fri Aug 24 13:58:40 2001
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Reply-To: "Larry Masinter - LMM@acm.org" <lmnet@attglobal.net>
From: "Larry Masinter - LMM@acm.org" <lmnet@attglobal.net>
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I wrote this up for discussion purposes, as a response
to some of the discussion about URNs, URIs, and the
difference between abstractions and resources that
describe them. The discussions have been on many mailing
lists (in the "to" list). However, in the interest of
reducing the number of duplicate messages, I suggest not
cc'ing all of these lists in subsequent discussions.


-----Original Message-----
From: nsyracus@cnri.reston.va.us On Behalf Of Internet-Drafts@ietf.org
Sent: Friday, August 24, 2001 3:43 AM
To: IETF-Announce:
Subject: I-D ACTION:draft-masinter-dated-uri-00.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.


        Title           : 'duri' and 'tdb': URN Namespaces based on dated URIs
        Author(s)       : L. Masinter
        Filename        : draft-masinter-dated-uri-00.txt
        Pages           :
        Date            : 22-Aug-01

This document defines two persistent namespaces of URNs based on
prepending a date to an (encoded) URI. The results are namespaces
in which names are readily assigned but which offer the persistence
of reference that is required by URNs. The first namespace (duri)
is used to refer to URI-identified resources themselves, while the
second namespace (tdb) is used to refer to abstractions that are
not themselves networked resources but are 'described by' them.
This idea and things like it have been discussed for several years,
but recent discussion about use of URIs and URNs for identifiers
in XML-based constructs has inspired writing this up more completely.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-masinter-dated-uri-00.txt

Internet-Drafts are also available by anonymous FTP. Login with the username
"anonymous" and a password of your e-mail address. After logging in,
type "cd internet-drafts" and then
        "get draft-masinter-dated-uri-00.txt".

A list of Internet-Drafts directories can be found in
http://www.ietf.org/shadow.html
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt


Internet-Drafts can also be obtained by e-mail.

Send a message to:
        mailserv@ietf.org.
In the body type:
        "FILE /internet-drafts/draft-masinter-dated-uri-00.txt".

NOTE:   The mail server at ietf.org can return the document in
        MIME-encoded form by using the "mpack" utility.  To use this
        feature, insert the command "ENCODING mime" before the "FILE"
        command.  To decode the response(s), you will need "munpack" or
        a MIME-compliant mail reader.  Different MIME-compliant mail readers
        exhibit different behavior, especially when dealing with
        "multipart" MIME messages (i.e. documents which have been split
        up into multiple messages), so check your local documentation on
        how to manipulate these messages.


From owner-urn-ietf@LISTS.NETSOL.COM  Tue Aug 28 08:08:41 2001
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Approved-By:  Juha Hakala <juha.hakala@HELSINKI.FI>
Message-ID:  <3B8B871C.8FC5CC30@helsinki.fi>
Date:         Tue, 28 Aug 2001 14:57:16 +0300
Reply-To: Juha Hakala <juha.hakala@HELSINKI.FI>
From: Juha Hakala <juha.hakala@HELSINKI.FI>
Subject:      URN NID registration for SICI (2nd try)
To: URN-IETF@LISTS.NETSOL.COM

This is a multi-part message in MIME format.
--------------9403216CFAFE0C3F10387A0A
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Dear Internet drafts editor and others,

Please find attached the first version of the URN Namespace ID
registration for Serial Item and Contribution Identifier, SICI (which is
the ANSI/NISO identifier for serial issues and articles). I sent the
registration request for the first time 1 August, but at that time was
not successful, because Internet draft submissions were cut off then due
to the IETF meeting.

The attached document is quite similar to the one I sent earlier. I have
corrected two erroneous statements about the DOI system, which Norman
Paskin pointed out to me (Norman, thank you for your help; in case there
are still some problems in the text please let me know). There are no
other changes.

Although SICI is not universally used like ISBN or ISSN, it is becoming
more popular in the Internet environment, where each serial article can
be an independent entity which can be accessed directly. This of course
makes identification on article level important. Identifying just the
serial is no longer sufficient.

The method proposed in the draft for resolving SICI-based URNs has been
implemented in experimental system built in co-operation by EU project
DIEPER and the ISSN International Centre. My colleagues in DIEPER and
staff in ISSN IC have given me very valuable support and guidance in
writing the draft.

The draft is attached in two versions: Word2000 and plain text with line
feeds.

Best regards,

Juha Hakala
--

****************************************************
 Juha Hakala
 Director, Information Technology
 Helsinki University Library
 tel +358 9 191 44293 fax +358 9 753 9514
 internet: juha.hakala@helsinki.fi
*****************************************************
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Network Working Group                                       Juha Hakala
Internet-Draft                              Helsinki University Library
Category: Informational                                  28 August 2001
draft-ietf-hakala-sici-00.txt
Expires: 28 February 2002





            Using Serial Item and Contribution Identifiers as
                         Uniform Resource Names

Status of this Memo

This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026.

Internet-Drafts are working documents of the Internet Engineering Task
Force (IETF), its areas, and its working groups. Note that other groups
may also distribute working documents as Internet-Drafts.

Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference material
or to cite them other than as "work in progress."

To view the entire list of Internet-Draft Shadow Directories, see
http://www.ietf.org/shadow.html.

This Internet-Draft will expire on 28 February 2002.

Abstract

This document discusses how Serial Item and Contribution Identifiers
(SICIs; persistent and unique identifiers for serial issues and
contributions such as articles) can be supported within the URN
framework and the syntax for URNs defined in RFC 2141 [Moats]. Much of
the discussion below is based on the ideas expressed in RFC 2288
[Lynch]. Chapter 5 contains a URN namespace registration request
modelled according to the template in RFC 2611 [Daigle et al.].


1. Introduction

As part of the validation process for the development of URNs the IETF
working group agreed that it is important to demonstrate that the
current URN syntax proposal can accommodate existing identifiers from
well-established namespaces.  One such infrastructure for assigning and
managing names comes from the bibliographic community.  Bibliographic
identifiers function as names for objects that exist both in print and,
increasingly, in electronic formats.  RFC 2288 [Lynch et. al.]
investigated the feasibility of using three identifiers (ISBN, ISSN and
SICI) as URNs.

SICI is an American national standard defined by NISO/ANSI Z39.56-1996
[NISO]. The need to develop a new version of the standard is at present
being investigated by NISO.

RFC 2288 does not – and it was not the aim of its authors – to analyse
how SICI-based URNs can actually be resolved. This text will specify one
solution to this question. There may be other, complementary resolution
services.

Generally, the difficulty of designing a URN resolution service is
dependent on two factors:

* Is the identifier dumb, or does it provide a hint on where to find a
resolution service?

* How many potential resolution services are there?

ISBN (International Standard Book Number) is a good example of an
intelligent identifier. Analysis of the ISBN will reveal not only the
region where the ISBN has been assigned, but also the publisher who is
responsible for the book. Resolution of ISBN-based URNs can be
decentralised to national bibliography databases, maintained by the
national libraries. If the ISBN was a dumb identifier, this would be
impossible.

International Standard Serial Number (ISSN) is a dumb identifier. It
does not have a publisher identifier; serials published by a certain
company get seemingly random ISSNs. Although ISSNs are allocated to
regional agencies in blocks, which gives the system some "intelligence",
a resolution service should not rely on these blocks, but use the global
ISSN database. It contains a bibliographic description of every
periodical that has received an ISSN. Thus, it is easy to resolve ISSN-
based URNs even though the identifier itself does not help in localising
the resolution service.

SICI is based on ISSN (see below for a description of its syntax). Like
ISSN, it is therefore a dumb identifier. But there is not, and will
never be, a global SICI database, which would contain bibliographic
information about every serial issue and/or article published in the
world. Most articles will not be catalogued at all, and the existing
bibliographic information about articles is dispersed into a large
number of databases maintained by publishers, libraries and other
information intermediaries. Although it might be technically possible to
merge records from these databases into a union catalogue, in practice
such an enterprise is not politically possible.

As a "dumb" identifier with a large and ever growing number of potential
resolution services SICI poses interesting challenges to the design of
the URN resolution process.

Generally, a combination of dumb identifier and multiple resolution
services is a problem, since there is no simple way of finding out which
resolution service is the correct one. A gateway service is needed for
providing this valuable information. Below we propose that for SICI-
based URNs, the global ISSN database will be capable of acting as a link
between the user and the resolution service.

The registration request for acquiring a Namespace Identifier (NID)
"SICI" for Serial Item and Contribution Identifiers has been written by
the National Library of Finland on behalf of the National Information
Standards Organization (NISO). The request is included in chapter 5 of
this text.

The document at hand is part of a global co-operation of the national
libraries to foster identification of electronic documents in general
and utilisation of URNs in particular. This work is co-ordinated by a
working group established by the Conference of Directors of National
Libraries (CDNL).

We have used the URN Namespace Identifier "SICI" for the Serial Item and
Contribution Identifiers in examples below.


2. Identification vs. Resolution

As a rule the SICIs identify finite, manageably-sized objects, but these
objects may still be large enough so that resolution to a hierarchical
system, such as all articles published in a serial issue, is
appropriate.

The materials identified by a SICI may exist only in printed or other
physical form, not electronically. The best that a resolver service will
be able to offer in this case is bibliographic data from the database
providing resolution services, including information about where the
physical resource is stored in the owner institution's holdings.


3. Serial Item and Contribution Identifier

3.1 Overview

The Serial Item and Contribution Identifier (SICI) standard defines a
variable length code that provides unique identification of serial items
(e.g., issues) and the contributions (e.g., articles) contained in a
serial title. SICI is specified in NISO/ANSI Z39.56-1996 [NISO2]. Like
other NISO standards, the SICI document is available for free in the Web.

SICI is based on ISSN (International Standard Serial Number), but
augments it extensively. SICI is a combination of three segments, all of
which are required:

Item segment; the data elements needed to describe the serial item such
as serial issue (ISSN, Chronology, Enumeration)

Contribution segment, the data elements needed to identify contributions
within an item (Location, Title Code)

Control segment, the data elements needed to record those administrative
elements that determine the validity, version, and format of the SICI
code representation.

RFC 2288 provides the following example:

   0015-6914(19960101)157:1<62:KTSW>2.0.TX;2-F

   The first nine characters are the ISSN identifying the serial title.
   The second component, in parentheses, is the chronology information
   giving the date the particular serial issue was published.  In this
   example that date was January 1, 1996.  The third component, 157:1,
   is enumeration information (volume, number) for the particular issue
   of the serial.  These three components comprise the "item segment" of
   a SICI code.  By augmenting the ISSN with the chronology and/or
   enumeration information, specific issues of the serial can be
   identified.  The next segment, <62:KTSW>, identifies a particular
   contribution within the issue.  In this example we provide the
   starting page number and a title code constructed from the initial
   characters of the title.  Identifiers assigned to a contribution can
   be used in the contribution segment if page numbers are
   inappropriate.  The rest of the identifier is the control segment,
   which includes a check character.  Interested readers are encouraged
   to consult the standard for an explanation of the fields in that
   segment.

SICI can be seen as a logical extension of the ISSN to the items and
individual contributions that make up a serial's hierarchical structure.
The current version of the SICI does have some limitations; it does not
allow identification of subsections of an article such as paragraphs or
diagrams. If deemed necessary, the functionality needed for article
subsection identification could be added to the standard.

The current version of SICI guarantees uniqueness in most situations;
however, the standard does not always differentiate between multiple
variant formats in which an electronic article may be published. For
instance, variants of a digitised article published in PDF and HTML
formats will receive the same SICI, provided that the ISSN is the same.

According to the rules of the ISSN centre, ISSN numbers can be applied
retrospectively to old periodicals. If the original printed document has
an ISSN, the same identifier is also valid for the digitised version.
ISSN guidelines formulate this principle in the following way:

A reproduction is a copy of an item and intended to function as a
substitute for that item. The reproduction may be in a different medium
from the original but it is not a different edition in itself. The ISSN
assigned to the original is valid for the reproduction, a new ISSN is not
assigned to the reproduction.

ISSN numbers are assigned by regional agencies, which receive ISSN
blocks from the ISSN International Centre. SICI usage is not dependent
on such formal agencies; the aim is that once ISSN is known, SICI codes
can be created, manually or by computer program, by publishers,
libraries, document delivery services or even by individual users.

Given the complexity of SICI codes, the recommended practice is to
automate the SICI creation process. If an article is structured enough,
all elements of SICI can be extracted from the document. A tool capable
of this has been built by the E.U. project DIEPER; this tool, of course,
only works properly if the document is structured in the way the DIEPER
project recommends. Another, less challenging option is a SICI
generator, which builds syntactically correct SICIs including the check
character if the basic ingredients are typed in manually.


3.2 Encoding Considerations and Lexical Equivalence

RFC 2288 contains the following simple and yet sufficient analysis of
SICI encoding:

   The character set for SICIs is intended to be email-transport-
   transparent, so it does not present major problems.  However, all
   printable excluded and reserved characters from the URN syntax are
   valid in the SICI character set and must be %-encoded.

   Example of a SICI for an issue of a journal:

          URN:SICI:1046-8188(199501)13:1%3C%3E1.0.TX;2-F

   For an article contained within that issue:

          URN:SICI:1046-8188(199501)13:1%3C69:FTTHBI%3E2.0.TX;2-4

   Equivalence rules for SICIs are not appropriate for definition as
   part of the namespace and incorporation in areas such as cache
   management algorithms.  It is best left to resolver systems which try
   to determine if two SICIs refer to the same content.  Consequently,
   we do not propose any specific rules for equivalence testing through
   lexical manipulation.


3.3 Resolution of SICI-based URNs

Since ISSN is a dumb code, SICI does not contain any explicit hint on
where to find the URN resolution service or services. However, an
efficient and global resolution service can be accomplished by using the
ISSN register as a way station. In spring 2001, the ISSN register
contained about one million bibliographic records describing serials,
including thousands of electronic journals. There are several other
databases, which contain hundreds of thousands of serial records, but
the ISSN register has the best coverage.

The first step in resolving a SICI-based URN is a query to the ISSN
register. The SICI resolution service in the ISSN register will parse
the SICI code in order to extract the ISSN from it.

ISSN will then be used as a search key for retrieving the bibliographic
record of the serial from the ISSN register.

Currently the ISSN register already contains thousands of records
describing electronic journals. These records contain the URL of the
serial's home page.

This URL is appropriate for resolving the URN based on the ISSN of the
periodical. The mechanism for resolving such URNs via the ISSN register
has been specified in RFC 3044 [Rozenfeld]. The ISSN International
Centre has already built a demonstration URN resolution service for
ISSN-based URNs into their present information system.

In order to resolve SICI-based URNs, a new data element has to be added
into the records in the ISSN register. This data element would contain
the network address (URL) of the database, which holds the article
required and/or bibliographic information about it. It must also be
possible to specify volumes and if necessary issues which are included
in the database within this data element. The data element should be
repeatable, since the same article may be available from multiple
sources. For instance, the publisher, Library of Congress
(http://www.loc.gov/), JSTOR (http://www.jstor.org/) and a number of
host services such as EBSCO (http://www.ebsco.com/home/) may all have a
copy of the same resource.

The SICI resolution service built into the ISSN register will check if
database address information is available in the bibliographic record of
the serial. Then it makes sure that the volume and/or issue needed is
available via the service. If this is the case, the application will
make the query, receive the result – article or bibliographic
information about it - and pass it on to the user.

The functionality described above was implemented in co-operation
between the ISSN International Centre and the E.U. project DIEPER
(http://gdz.sub.uni-goettingen.de/dieper/). The SICI resolution service
is an extension of the service built for resolving ISSN-based URNs. By
March 2001 a demonstrator service via which several of the databases
maintained by the project partners could be accessed was released for
internal use within the project. The ISSN IC and project partners wish
to maintain the service also after the formal end of the project.

Discussions about adding the new data element into bibliographic records
in the ISSN register are under way.

Please note that the discussion herein applies to SICIs assigned to
serial contributions. Since serial items (issues) have seldom been
described or digitised as such, a search by serial item SICI will in
practice be expanded into retrieval of all contributions (articles)
within the serial item (issue) in question.

If a resolution service for the resource at hand does not exist, or the
user is not authorised to utilise it, he/she may get the bibliographic
description of the serial from the ISSN register.


3.4 Additional considerations

Electronic journals have rapidly become very popular in scientific
publishing. The main reasons for this are the emergence of viable
business models (e.g. licensing) and the birth of a reliable and
efficient delivery mechanism (the Web).

New content is being added via two different channels. A significant
number of scientific journals is published in electronic form, usually
alongside a printed version. On the other hand, old printed volumes are
digitised and made available in electronic form. Digitisation is done by
development projects such as DIEPER, established services such as JSTOR,
or publishers - for instance Elsevier is digitising all printed journals
the company has published.

Reliable linking of articles to references and bibliographic data about
the articles is an important issue. URLs are as of this writing the most
common means used for linking, but their reliability is low; average
lifetime for a URL is estimated to be two years.

A more reliable linking mechanism than URLs is urgently needed. Many
scientific publishers are already using Digital Object Identifiers (DOI)
for their materials. DOI resolution service is based on Handle system,
which is "a comprehensive system for assigning, managing, and resolving
persistent identifiers, known as "handles," for digital objects and
other resources on the Internet" (see
http://www.handle.net/introduction.html). Handles can be used as Uniform
Resource Names(URNs).

URN is both an identifier and a non-commercial and technically advanced
resolution service. Due to the co-operation of the ISSN International
Centre the URN resolution service for articles outlined in this Internet
standard is global, and can accommodate an unlimited number of article
services located anywhere in the world.

For instance, in order to establish URN-based links to articles
digitised in JSTOR service, a number of steps are necessary. First, each
article must be identified by SICI, and these SICIs must be indexed in
the JSTOR database. Second, bibliographic records of JSTOR journals in
the ISSN register must all be enriched with a link to the JSTOR search
interface and volume/issue information. For instance, the bibliographic
record describing the journal "Ecology" must contain the information
that volumes 1-77 (1920-1996) are available via JSTOR. This information
may be quite volatile, and maintenance of the ISSN register must
therefore be frequent and efficient.

Apart from modification of the data, some programming work is needed.
Due to the work done in the DIEPER project, the ISSN register already
has the functionality needed for resolving SICI-based URNs. Adding the
required functionality into the JSTOR database may or may not be
difficult depending on the system architecture; in DIEPER some partners
were able to implement the required functionality quite easily.

Since the Web browsers do not support URN resolution yet, the final step
in enabling resolution of URN-based SICIs is installation of the browser
plug-in developed by the ISSN International Centre.

For various reasons, one article may be available in several locations.
Every article copy may have a different set of users who are allowed
access to it. For instance, a copy acquired by a national library via
legal deposit may only be available within the library premises.

Making the links context sensitive – provide only those links that
"work" for a user is a challenge. OpenURL framework [Van de Sompel]
provides a means for sensitive linking. As of this writing OpenURL is
rapidly gaining popularity, and there are already a few integrated
library systems which support it. The ISSN register may in the future
support OpenURL usage; this would be very valuable when the same
resource (article) is available from several sources, which have
different user population.

In their present form the URN resolution services provided via the ISSN
register suit those services best, which are available in public domain,
and are reasonably stable. Numerous digitisation projects such as DIEPER
are currently making printed articles available in the Web in digital
form.

An additional benefit of coding the needed location and volume
information into the ISSN register would be that this database then
could also serve as a global registry of serial digitisation efforts.
Such a register is badly needed to avoid duplicate work.

Since the number of SICI resolution services will eventually be high,
the capacity of the server on which the ISSN register runs and its
network connection may become a bottleneck, especially if the articles
were delivered via the ISSN server to the users. Setting up mirror sites
would in this case be the most efficient means for load control and
balancing. Technically the setting up of mirror sites is not difficult.
The ISSN register contains approximately a million bibliographic
records, and is therefore not a very large database.


4. Security Considerations

This document proposes means of encoding and using Serial Item and
Contribution Identifiers within the URN framework. This document does
not discuss resolution except at a generic level; thus questions of
secure or authenticated resolution mechanisms in the ISSN register or in
actual resolution services are out of scope.  This text does not address
means of validating the integrity or authenticating the source or
provenance of URNs that contain SICIs.  Issues regarding intellectual
property rights associated with objects identified by the various
bibliographic identifiers are also beyond the scope of this document, as
are questions about rights to the databases that might be used to
construct resolvers.


5. Namespace registration

URN Namespace ID Registration for the Serial Item and Contribution
Identifier (SICI)

Namespace ID:

SICI

SICI is a well-established acronym for Serial Item and Contribution
Identifiers; giving this NID for any other system would cause a lot of
confusion.

This namespace ID has already been used in SICI-based URNs in the E.U.
project DIEPER.

Registration Information:

Version: 1
Date: 2001-08-28


Declared registrant of the namespace:

Name: Patricia Harris
E-mail: pharris@niso.org
Affiliation: National Information Standards Organisation
Address: 4733 Bethesda Avenue, Suite 300, Bethesda, MD 20814

Declaration of syntactic structure:

Each SICI contains three segments:

Item segment; the data elements needed to describe the serial item such
as serial issue (ISSN, Chronology, Enumeration)

Contribution segment, the data elements needed to identify contributions
within an item (Location, Title Code)

Control segment, the data elements needed to record those administrative
elements that determine the validity, version, and format of the SICI
code representation.

Example:

   0015-6914(19960101)157:1<62:KTSW>2.0.TX;2-F

SICI codes can be generated and parsed by computer programs.


Relevant ancillary documentation:

SICI is an American national standard defined by NISO/ANSI Z39.56-1996
[NISO2]. A new version of the standard is currently under development.


Identifier uniqueness considerations:

SICI codes will almost always be unique. Since SICI is based on ISSN,
articles from different journals will definitely never get the same
SICI. Since enumeration and chronology information must also be given,
articles and other contributions published in different volumes and
issues will also never get the same SICI.

SICIs may not be unique if and only if:

If two or more contributions are published on the same page(s) and if
they have similar enough titles (the first letter of each word is the
same).

In a single issue of an electronic journal (which lacks page numbers)
there are two or more contributions with titles similar enough.

If there are several technical variants of an electronic serial
contribution (multiple formats, multiple resolutions) the current
version of SICI will not make any difference between these variants. In
this case the intellectual content will usually be the same, but layout
will differ from one version to another.

The new version of the SICI standard will be enhanced in order to
diminish the risk of non-unique SICIs.


Identifier persistence considerations:

Once assigned, SICI will never change. The same SICI will not be used
again for other serial items and contributions.

Process of identifier assignment:

There will not be a national, regional or international agency governing
the SICI assignment process. Publishers, libraries or other information
intermediaries will create SICIs when needed. The most important
prerequisite is that the journal must have an ISSN.

Although SICI assignment is decentralised, the national ISSN agencies
and the ISSN International Centre may support publishers and other
interested parties in SICI implementation.

SICI can - and should - be built via automated means. If the source
document such as article is sufficiently structured, SICI can be
generated without human involvement. Another option is a semi-automated
process, in which a human user types in the relevant data elements, and
the application takes care of building the code.

Process for identifier resolution:

Resolution will take place in two steps as defined in chapter 3.3. First
the ISSN register is used for finding the location of the resolution
service(s) for the serial and volume at hand. Using the linking
information stored in the serial's bibliographic record, the correct
resolution service is contacted, and the requested resource is delivered
to the user.


Rules for Lexical Equivalence:

We do not propose any specific rules for equivalence testing through
lexical manipulation.


Conformance with URN Syntax:

According to the RFC 2288:

The character set for SICIs is intended to be email-transport-
transparent, so it does not present major problems.  However, all
printable excluded and reserved characters from the URN syntax are
valid in the SICI character set and must be %-encoded.

Example of a SICI for an issue of a journal:

     URN:SICI:1046-8188(199501)13:1%3C%3E1.0.TX;2-F

For an article contained within that issue:

     URN:SICI:1046-8188(199501)13:1%3C69:FTTHBI%3E2.0.TX;2-4


Validation mechanism:

Validity of a SICI string can be checked by modulus 37 check digit.


Scope:

Global.


6. References

[Daigle et al.]: Daigle, L., van Gulik, D., Iannella, R. & Faltstrom,
P.: URN Namespace Definition Mechanisms, RFC2611, June 1999.

[Lynch] Lynch, C., Using Existing Bibliographic Identifiers as Uniform
Resource Names, RFC 2288, February 1998

[Moats] Moats, R., URN Syntax, RFC 2141, May 1997.

[NISO] NISO/ANSI Z39.56-1996 Serial Item and Contribution Identifier.
Electronic resource, available at http://www.techstreet.com/cgi-
bin/pdf/free/152629/z39-56.pdf

[Rozenfeld] Rozenfeld, S., Using The ISSN (International Serial Standard
Number) as URN (Uniform Resource Names) within an ISSN-URN Namespace,
RFC 3044, January 2001.

[Van de Sompel] Van de Sompel, Herbert & Beit-Arie, Oren: Open Linking
in the Scholarly Information Environment Using the OpenURL Framework. D-
Lib Magazine, March 2001. Electronic resource, available at
http://www.dlib.org/dlib/march01/vandesompel/03vandesompel.html


7. Authors' Address

   Juha Hakala
   Helsinki University Library - The National Library of Finland
   P.O. Box 26
   FIN-00014 Helsinki University
   FINLAND

   E-mail: juha.hakala@helsinki.fi


8.  Full Copyright Statement

   Copyright (C) The Internet Society (2001).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.



 DIEPER (niin kuin kaikkialla muualla tekstissä…)

--------------9403216CFAFE0C3F10387A0A--


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        Title           : A DDDS Database Using The Domain Name System
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        Filename        : draft-ietf-urn-dns-ddds-database-06.txt
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        Date            : 29-Aug-01

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A specification for taking a URI and locating an authoritative
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From: Michael Mealling <michael@neonym.net>
Subject:      recent drafts that were updated....
To: URN-IETF@LISTS.NETSOL.COM

The two drafts you just saw go by contained some edits requested by the
IESG that clarified how DNS servers and clients handle additional information
processing. Nothing of substance has changed....

I _hope_ these are the last edits....

-MM

--
--------------------------------------------------------------------------------
Michael Mealling        |      Vote Libertarian!       | urn:pin:1
michael@neonym.net      |                              | http://www.neonym.net


