Re: [urn] Suggested PWID URN for Persistent Web IDentifiers - version 3
worley@ariadne.com (Dale R. Worley) Sat, 21 July 2018 03:12 UTC
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From: worley@ariadne.com
To: Eld Zierau <elzi@kb.dk>
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Subject: Re: [urn] Suggested PWID URN for Persistent Web IDentifiers - version 3
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Comments on this draft: I am by no means an archivist, so my comments will be largely technical. The draft seems to me to be prolix, giving a lot of discussion of details that are not reflected in the URN proposal itself. A careful editing will probably fix this. A major component of pwid-urn is archive-id. My assumption is that the archive-id is the top-level component and defines what abstract "archive" the URN is a reference into. And that the "archive" defines the exact interpretation of archival-tine, coverage-spec, and archived-item. However, in order for PWID URNs to be unambiguous, it must be unambiguous what "archive" a given archive-id refers to. The draft suggests "it is recommended to use the web domain as the identifier for the web archive". What if an institution decides to create PWID URNs that use an archive-id which is a domain name that the institution does not own? As written, the draft does not forbid *me* from creating PWID URNs with archive-id "netarkivet.dk". In regard to archival-time, the draft states "The 'archival-time' [...] can therefore be specified at any of the levels of granularity as described in [W3CDTF]." However, W3CDTF gives a number of formats for time designations, and calls those formats "granularities", whereas this draft allows only one format. I suspect that a more careful description of the meaning of the quoted sentence would fix this problem. The syntax assumes that knowing archive-id, archival-time, coverage-spec, and archived-item (the archived URI) will always be sufficient to specify exactly the resource in question. However, it seems likely that special situations will arise when two distinct resources will have attributes that are similar enough that the distinction between them is not easily expressed in terms of archive-id, archival-time, coverage-spec, or archived URI. In this case, additional information is needed to create an exact reference, and the URN syntax needs to have an expansion facility to allow this. archived-item can be a URI, and a URI can contain the characters '?', '#', '[', and ']', among others. However, those 4 characters may not appear in the NSS part of a URN. Note that the first 2 of these characters are used in URIs only to introduce the "query" and "fragment" parts, but as the draft is written, the archived-item URI is not restricted to not having a query or fragment part. Dale
- [urn] Suggested PWID URN for Persistent Web IDent… Eld Zierau
- Re: [urn] Suggested PWID URN for Persistent Web I… Dale R. Worley
- Re: [urn] Suggested PWID URN for Persistent Web I… Henry S. Thompson
- Re: [urn] Suggested PWID URN for Persistent Web I… Hakala, Juha E
- Re: [urn] Suggested PWID URN for Persistent Web I… Eld Zierau
- Re: [urn] Suggested PWID URN for Persistent Web I… Dale R. Worley
- Re: [urn] Suggested PWID URN for Persistent Web I… Eld Zierau
- Re: [urn] Suggested PWID URN for Persistent Web I… Dale R. Worley
- [urn] PWID as citation (was: Suggested PWID URN f… Dale R. Worley
- Re: [urn] PWID as citation (was: Suggested PWID U… Eld Zierau
- Re: [urn] PWID as citation (was: Suggested PWID U… Eld Zierau
- Re: [urn] PWID as citation (was: Suggested PWID U… Eld Zierau