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From: "Svensson, Lars" <L.Svensson@dnb.de>
To: Eld Zierau <elzi@kb.dk>, "Dale R. Worley" <worley@ariadne.com>
CC: "urn@ietf.org" <urn@ietf.org>
Thread-Topic: Re: [urn] Comments/answers to reasons for changes in PWID URN version 4 - diff version 3 and 4
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Date: Mon, 18 Feb 2019 17:05:36 +0000
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Subject: Re: [urn] Comments/answers to reasons for changes in PWID URN version 4 - diff version 3 and 4
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Dear Eld,



*  'precision-spec' values are not case sensitive (i.e.  "PAGE" /
         "PART" / "PaGe" / ... are valid values as well.)

On Monday, January 21, 2019 2:15 PM, Eld Zierau [mailto:elzi@kb.dk] wrote:

> Is there any particular area you  think needs approvement?

Having re-read the I-D, I'd say that there are two areas still unclear to m=
e:
1) The syntax specification says=20
*  'precision-spec' values are not case sensitive (i.e.  "PAGE" /
         "PART" / "PaGe" / ... are valid values as well.)
It says nothing about the other parts so I guess that case sensitiveness de=
faults to the specification in RFC 8141 =A73 [1] which says that all parts =
of URNs are case sensitive except for the string "urn" and the NID. It woul=
d be helpful, though, if that was made explicit (including a reference to R=
FC 8141 =A73).

2) The document refers to a (proposed) registry of archive names without gi=
ving any particulars of where this will be set up and who will manage it. I=
f you say that there currently is no information about that, that's fine, o=
therwise it would be helpful to get more information on that (especially if=
 it's going to be operated by IANA).

[1] https://tools.ietf.org/html/rfc8141#section-3.1

Best,

Lars
=20
> -----Original Message-----
> From: Svensson, Lars <L.Svensson@dnb.de>
> Sent: Thursday, January 17, 2019 3:47 PM
> To: Dale R. Worley <worley@ariadne.com>; Eld Zierau <elzi@kb.dk>
> Cc: urn@ietf.org
> Subject: RE: Re: [urn] Comments/answers to reasons for changes in PWID UR=
N
> version 4 - diff version 3 and 4
>=20
> Apologies for not commenting on this draft until now...
>=20
> Version 4 of PWID has matured considerably compared to version 3 and I th=
ink it
> needs at the most one or two more iterations until it's ready for registr=
ation.
>=20
> I find the discussion about an IANA registry for names of web archives ve=
ry
> interesting and would support the creation of such a registry. The number=
 of such
> archives will probably be of manageable size (about the same size as the =
number of
> national libraries...).
>=20
> I also have a number of minor editorial issues but would wait with those =
until the
> contents of the draft are more stable.
>=20
> Best,
>=20
> Lars
>=20
> > -----Original Message-----
> > From: urn [mailto:urn-bounces@ietf.org] On Behalf Of Dale R. Worley
> > Sent: Monday, November 05, 2018 2:02 AM
> > To: Eld Zierau <elzi@kb.dk>
> > Cc: urn@ietf.org
> > Subject: [Marketing Mail] Re: [urn] Comments/answers to reasons for
> > changes in PWID URN version 4 - diff version 3 and 4
> >
> > Eld Zierau <elzi@kb.dk> writes:
> > > Here is the promised Word file with differences between version 3
> > > and 4
> >
> > > [2:application/vnd.openxmlformats-officedocument.wordprocessingml.do
> > > cument
> > Show Save:PWID_from_V3_to_V4.docx (81kB)]
> >
> > Why not just give the URL to the datatracker's history page for the I-D=
:
> > https://datatracker.ietf.org/doc/draft-pwid-urn-specification/history/
> > and the URL for the diff between v3 and v4, in the format that
> > basically everybody in the IETF is familiar with:
> > https://www.ietf.org/rfcdiff?url1=3Ddraft-pwid-urn-specification-03&url=
2
> > =3Ddraft-pwid-
> > urn-specification-04
> >
> > Dale
> >
> > _______________________________________________
> > urn mailing list
> > urn@ietf.org
> > https://www.ietf.org/mailman/listinfo/urn


From nobody Thu Feb 21 05:44:56 2019
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From: Eld Zierau <elzi@kb.dk>
To: "Svensson, Lars" <L.Svensson@dnb.de>, "Dale R. Worley" <worley@ariadne.com>
CC: "urn@ietf.org" <urn@ietf.org>
Thread-Topic: Re: [urn] Comments/answers to reasons for changes in PWID URN version 4 - diff version 3 and 4
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Subject: Re: [urn] Comments/answers to reasons for changes in PWID URN version 4 - diff version 3 and 4
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Thank you Lars

I expect to upload a new version next week which makes these clarifications

Best regards, Eld

-----Original Message-----
From: Svensson, Lars <L.Svensson@dnb.de>=20
Sent: Monday, February 18, 2019 6:06 PM
To: Eld Zierau <elzi@kb.dk>; Dale R. Worley <worley@ariadne.com>
Cc: urn@ietf.org
Subject: RE: Re: [urn] Comments/answers to reasons for changes in PWID URN =
version 4 - diff version 3 and 4

Dear Eld,



*  'precision-spec' values are not case sensitive (i.e.  "PAGE" /
         "PART" / "PaGe" / ... are valid values as well.)

On Monday, January 21, 2019 2:15 PM, Eld Zierau [mailto:elzi@kb.dk] wrote:

> Is there any particular area you  think needs approvement?

Having re-read the I-D, I'd say that there are two areas still unclear to m=
e:
1) The syntax specification says
*  'precision-spec' values are not case sensitive (i.e.  "PAGE" /
         "PART" / "PaGe" / ... are valid values as well.) It says nothing a=
bout the other parts so I guess that case sensitiveness defaults to the spe=
cification in RFC 8141 =A73 [1] which says that all parts of URNs are case =
sensitive except for the string "urn" and the NID. It would be helpful, tho=
ugh, if that was made explicit (including a reference to RFC 8141 =A73).

2) The document refers to a (proposed) registry of archive names without gi=
ving any particulars of where this will be set up and who will manage it. I=
f you say that there currently is no information about that, that's fine, o=
therwise it would be helpful to get more information on that (especially if=
 it's going to be operated by IANA).

[1] https://tools.ietf.org/html/rfc8141#section-3.1

Best,

Lars
=20
> -----Original Message-----
> From: Svensson, Lars <L.Svensson@dnb.de>
> Sent: Thursday, January 17, 2019 3:47 PM
> To: Dale R. Worley <worley@ariadne.com>; Eld Zierau <elzi@kb.dk>
> Cc: urn@ietf.org
> Subject: RE: Re: [urn] Comments/answers to reasons for changes in PWID=20
> URN version 4 - diff version 3 and 4
>=20
> Apologies for not commenting on this draft until now...
>=20
> Version 4 of PWID has matured considerably compared to version 3 and I=20
> think it needs at the most one or two more iterations until it's ready fo=
r registration.
>=20
> I find the discussion about an IANA registry for names of web archives=20
> very interesting and would support the creation of such a registry.=20
> The number of such archives will probably be of manageable size (about=20
> the same size as the number of national libraries...).
>=20
> I also have a number of minor editorial issues but would wait with=20
> those until the contents of the draft are more stable.
>=20
> Best,
>=20
> Lars
>=20
> > -----Original Message-----
> > From: urn [mailto:urn-bounces@ietf.org] On Behalf Of Dale R. Worley
> > Sent: Monday, November 05, 2018 2:02 AM
> > To: Eld Zierau <elzi@kb.dk>
> > Cc: urn@ietf.org
> > Subject: [Marketing Mail] Re: [urn] Comments/answers to reasons for=20
> > changes in PWID URN version 4 - diff version 3 and 4
> >
> > Eld Zierau <elzi@kb.dk> writes:
> > > Here is the promised Word file with differences between version 3=20
> > > and 4
> >
> > > [2:application/vnd.openxmlformats-officedocument.wordprocessingml.
> > > do
> > > cument
> > Show Save:PWID_from_V3_to_V4.docx (81kB)]
> >
> > Why not just give the URL to the datatracker's history page for the I-D=
:
> > https://datatracker.ietf.org/doc/draft-pwid-urn-specification/histor
> > y/ and the URL for the diff between v3 and v4, in the format that=20
> > basically everybody in the IETF is familiar with:
> > https://www.ietf.org/rfcdiff?url1=3Ddraft-pwid-urn-specification-03&ur
> > l2
> > =3Ddraft-pwid-
> > urn-specification-04
> >
> > Dale
> >
> > _______________________________________________
> > urn mailing list
> > urn@ietf.org
> > https://www.ietf.org/mailman/listinfo/urn


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From: Eld Zierau <elzi@kb.dk>
To: "Svensson, Lars" <L.Svensson@dnb.de>, "Dale R. Worley" <worley@ariadne.com>
CC: "urn@ietf.org" <urn@ietf.org>
Thread-Topic: Re: [urn] Comments/answers to reasons for changes in PWID URN version 4 - diff version 3 and 4
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Date: Wed, 27 Feb 2019 12:59:51 +0000
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Subject: Re: [urn] Comments/answers to reasons for changes in PWID URN version 4 - diff version 3 and 4
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I have now uploaded a new version with clarifications. I have also had it t=
hrough an additional language review, and sharpened the language.

I have plans (and allocated time) to start a process of proposing a registr=
y, but it will be much easier to proceed this work if there is an accepted =
PWID URN to refer to.
Furthermore, I have spoken to the Open Preservation Foundation about hostin=
g a PWID resolver (based on our prototype), which they are interested in.=20

Hope this satisfy the comments, otherwise please let me know.

Best regards, Eld
=20
-----Original Message-----
From: Eld Zierau=20
Sent: Thursday, February 21, 2019 2:45 PM
To: 'Svensson, Lars' <L.Svensson@dnb.de>; Dale R. Worley <worley@ariadne.co=
m>
Cc: urn@ietf.org
Subject: RE: Re: [urn] Comments/answers to reasons for changes in PWID URN =
version 4 - diff version 3 and 4

Thank you Lars

I expect to upload a new version next week which makes these clarifications

Best regards, Eld

-----Original Message-----
From: Svensson, Lars <L.Svensson@dnb.de>
Sent: Monday, February 18, 2019 6:06 PM
To: Eld Zierau <elzi@kb.dk>; Dale R. Worley <worley@ariadne.com>
Cc: urn@ietf.org
Subject: RE: Re: [urn] Comments/answers to reasons for changes in PWID URN =
version 4 - diff version 3 and 4

Dear Eld,



*  'precision-spec' values are not case sensitive (i.e.  "PAGE" /
         "PART" / "PaGe" / ... are valid values as well.)

On Monday, January 21, 2019 2:15 PM, Eld Zierau [mailto:elzi@kb.dk] wrote:

> Is there any particular area you  think needs approvement?

Having re-read the I-D, I'd say that there are two areas still unclear to m=
e:
1) The syntax specification says
*  'precision-spec' values are not case sensitive (i.e.  "PAGE" /
         "PART" / "PaGe" / ... are valid values as well.) It says nothing a=
bout the other parts so I guess that case sensitiveness defaults to the spe=
cification in RFC 8141 =A73 [1] which says that all parts of URNs are case =
sensitive except for the string "urn" and the NID. It would be helpful, tho=
ugh, if that was made explicit (including a reference to RFC 8141 =A73).

2) The document refers to a (proposed) registry of archive names without gi=
ving any particulars of where this will be set up and who will manage it. I=
f you say that there currently is no information about that, that's fine, o=
therwise it would be helpful to get more information on that (especially if=
 it's going to be operated by IANA).

[1] https://tools.ietf.org/html/rfc8141#section-3.1

Best,

Lars
=20
> -----Original Message-----
> From: Svensson, Lars <L.Svensson@dnb.de>
> Sent: Thursday, January 17, 2019 3:47 PM
> To: Dale R. Worley <worley@ariadne.com>; Eld Zierau <elzi@kb.dk>
> Cc: urn@ietf.org
> Subject: RE: Re: [urn] Comments/answers to reasons for changes in PWID=20
> URN version 4 - diff version 3 and 4
>=20
> Apologies for not commenting on this draft until now...
>=20
> Version 4 of PWID has matured considerably compared to version 3 and I=20
> think it needs at the most one or two more iterations until it's ready fo=
r registration.
>=20
> I find the discussion about an IANA registry for names of web archives=20
> very interesting and would support the creation of such a registry.
> The number of such archives will probably be of manageable size (about=20
> the same size as the number of national libraries...).
>=20
> I also have a number of minor editorial issues but would wait with=20
> those until the contents of the draft are more stable.
>=20
> Best,
>=20
> Lars
>=20
> > -----Original Message-----
> > From: urn [mailto:urn-bounces@ietf.org] On Behalf Of Dale R. Worley
> > Sent: Monday, November 05, 2018 2:02 AM
> > To: Eld Zierau <elzi@kb.dk>
> > Cc: urn@ietf.org
> > Subject: [Marketing Mail] Re: [urn] Comments/answers to reasons for=20
> > changes in PWID URN version 4 - diff version 3 and 4
> >
> > Eld Zierau <elzi@kb.dk> writes:
> > > Here is the promised Word file with differences between version 3=20
> > > and 4
> >
> > > [2:application/vnd.openxmlformats-officedocument.wordprocessingml.
> > > do
> > > cument
> > Show Save:PWID_from_V3_to_V4.docx (81kB)]
> >
> > Why not just give the URL to the datatracker's history page for the I-D=
:
> > https://datatracker.ietf.org/doc/draft-pwid-urn-specification/histor
> > y/ and the URL for the diff between v3 and v4, in the format that=20
> > basically everybody in the IETF is familiar with:
> > https://www.ietf.org/rfcdiff?url1=3Ddraft-pwid-urn-specification-03&ur
> > l2
> > =3Ddraft-pwid-
> > urn-specification-04
> >
> > Dale
> >
> > _______________________________________________
> > urn mailing list
> > urn@ietf.org
> > https://www.ietf.org/mailman/listinfo/urn


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Subject: Re: [urn] Comments/answers to reasons for changes in PWID URN version 4 - diff version 3 and 4
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Eld Zierau <elzi@kb.dk> writes:
> I have now uploaded a new version with clarifications. I have also had
> it through an additional language review, and sharpened the language.

To make everyone's life easier, the new draft is:
draft-pwid-urn-specification-05

Dale


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Subject: [urn] Comments on PWID -05
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The discussion of archive-id is considerably clearer than before but it
seems to me that there should be some discussion of how to distinguish
domain name archive-ids (e.g., netarkivet.dk) and archive-ids that have
to be looked up in the (future) registry.  Being able to reliably make
this decision seems to be the first step in resolving a PWID.

I think arranging this is straightforward, since the syntax of
archive-id is "+( unreserved )", and many of those strings are not
allowed as DNS names for hosts.  E.g., one could require that any
archive-id that is not intended to be interpreted as a DNS name to start
with one of "-", ".", "_", "~".

Similar considerations apply to archived-item-id and distinguishing it
from URI.  (All URIs must start with a letter.)

           precision-spec = "part" / "page" / "subsite" / "site"
                    / "collection" / "recording" / "snapshot"
                    / "other"

Is the inclusion of "other" the best way to handle this?  Usually a
component like this would allow "extension values" (that conform to the
same syntax as the defined values, e.g., "+letter").  As written,
everything that cannot be classified as "part", "page", ..., "snapshot"
would have to be labeled "other", even if a particular archive had
several different additional precision values that it operated with
internally.

      *  'URI' is defined as in [RFC3986] but where occurrences of "[",
         "]", "?" and "#" are %-encoded in order not to clash with URN
         reserved characters [RFC8141].

This gets complicated.  For example "http://example.com/foo#bar" is a
different URL than "http://example.com/foo%23bar", and might have
different contents.  You can't use "http://example.com/foo%23bar" as the
archived-item part of PWIDs for the saved contents of both of these
URLs.

One possibility is to set the archived-item string to be URI with [, ],
?, #, and % all %-encoded, so that the two URLs have these archived-item
values:
    http://example.com/foo%23bar
    http://example.com/foo%2523bar
That would be laborious, though, if many URLs contain %-escapes and
humans have to copy PWID URNs by hand.

      *  'archival-time' is a UTC timestamp as described in the W3C
         profile of [ISO8601] [W3CDTF] (also defined in [RFC3339]), for
         example YYYY-MM-DDThh:mm:ssZ.

Looking at RFC 3339, I see:

   date-fullyear   = 4DIGIT
   date-month      = 2DIGIT  ; 01-12
   date-mday       = 2DIGIT  ; 01-28, 01-29, 01-30, 01-31 based on
                             ; month/year
   time-hour       = 2DIGIT  ; 00-23
   time-minute     = 2DIGIT  ; 00-59
   time-second     = 2DIGIT  ; 00-58, 00-59, 00-60 based on leap second
                             ; rules
   time-secfrac    = "." 1*DIGIT
   time-numoffset  = ("+" / "-") time-hour ":" time-minute
   time-offset     = "Z" / time-numoffset

   partial-time    = time-hour ":" time-minute ":" time-second
                     [time-secfrac]
   full-date       = date-fullyear "-" date-month "-" date-mday
   full-time       = partial-time time-offset

   date-time       = full-date "T" full-time

But comparing that to W3CDTF, I see no single nontermainal which
corresponds to the set of formats allowed in W3CDTF.  I suggest you make
a more rigid specification as to what is allwed for archival-time.

   [W3CDTF]   W3C, "Date and Time Formats: note submitted to the W3C. 15
              September 1997", 1997,
              <http://www.w3.org/TR/NOTE-datetime>.

              W3C profile of ISO 8601 urn:pwid:archive.org:2017-04-
              03T03:37:42Z:page:http://www.w3.org/TR/NOTE-datetime

The final two lines of this block look like a mis-formatted
bibliographic reference.

Dale


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From: Eld Zierau <elzi@kb.dk>
To: =?utf-8?B?TWFydGluIEouIETDvHJzdA==?= <duerst@it.aoyama.ac.jp>, "Dale R. Worley" <worley@ariadne.com>
CC: "urn@ietf.org" <urn@ietf.org>, "L.Svensson@dnb.de" <L.Svensson@dnb.de>
Thread-Topic: [urn] Comments on PWID -05
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Date: Thu, 28 Feb 2019 10:42:35 +0000
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Subject: Re: [urn] Comments on PWID -05
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From: worley@ariadne.com (Dale R. Worley)
To: "Martin J. =?utf-8?Q?D=C3=BCrst?=" <duerst@it.aoyama.ac.jp>
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Subject: Re: [urn] Comments on PWID -05
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Martin J. Duerst <duerst@it.aoyama.ac.jp> writes:
>> [...]  E.g., one could require that any
>> archive-id that is not intended to be interpreted as a DNS name to start
>> with one of "-", ".", "_", "~".
>
> I haven't looked into the details, but in general, I think this is a bad 
> idea. It is much better to have an explicit distinction than to rely on 
> some syntax restrictions. Such syntax restrictions may or may not 
> actually hold in practice. It's very easy to create a DNS name starting 
> with '-' or '_', for example, even though officially, that's not allowed.

I may agree with you ... But what do you mean by "an explicit
distinction"?  E.g., I would tend to consider "archive-ids starting with
'~' are registered archive names, and archive-ids that do not are
considered DNS names" to be an "explicit" distinction, but you mean
something else.

Or maybe the right question is, What do you propose as an alternative?

Dale


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