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Re: Towards a TAG consideration of CURIEs

From: Richard Cyganiak <richard@cyganiak.de>
Date: Sat, 7 Apr 2007 17:03:59 +0200
Message-Id: <04CB5449-731F-47FA-BDEA-55A7569B14CE@cyganiak.de>
Cc: www-tag@w3.org, semantic-web@w3.org, public-xg-mmsem@w3.org, newsml-g2@yahoogroups.com
To: Misha Wolf <Misha.Wolf@reuters.com>


On 7 Apr 2007, at 01:32, Misha Wolf wrote:
> Given a code such as "123456", and given that we refuse to change
> the code to, say, "_123456", the main legal choices before us
> appear to be:
>
> 1. Simple concatenation using "/" as the delimiter
>    "http://www.iptc.org/NewsCodes/" & "123456" ->
>    "http://www.iptc.org/NewsCodes/123456"
>
> 2. Simple concatenation using "#_" as the delimiter
>    "http://www.iptc.org/NewsCodes#_" & "123456" ->
>    "http://www.iptc.org/NewsCodes#_123456"
>
> 3. Concatenation using "#_" as the delimiter, where the "_" is
>    glue, mandated by the relevant specification
>    "http://www.iptc.org/NewsCodes#" & "_" & "123456" ->
>    "http://www.iptc.org/NewsCodes#_123456"
>
> 4. Concatenation using "#_" as the delimiter, where the "#_" is
>    glue, mandated by the relevant specification
>    "http://www.iptc.org/NewsCodes" & "#_" & "123456" ->
>    "http://www.iptc.org/NewsCodes#_123456"
>
> As we would very strongly prefer to end up with a Web page per
> Taxonomy, containing a descriptive entry per concept, where the
> constructed URI results in the relevant entry, we are not
> enthusiastic about option 1.

I don't really want to get into yet another hash vs. slash debate,  
but I do want to point out that it is possible to get what you want  
with option 1, though it requires a tiny bit of extra work. Example  
Apache configuration:

     Redirect 303 /NewsCodes/ http://www.iptc.org/docs/newscodes.html#

This will transparently redirect http://www.iptc.org/NewsCodes/123456  
to http://www.iptc.org/docs/newscodes.html#123456. HTTP redirects are  
hardly rocket science.

Cheers,
Richard



>
> That appears to leave options 2, 3 and 4.  We have felt uneasy
> about choosing between them without considered advice from the
> SemWeb community.
>
> As we are freezing the XML Schema for the News Architecture for our
> G2 Standards next week, and hope to ratify it at our AGM in Tokyo
> next month, this is an excellent time to consider and resolve the
> question of how to build URIs for Taxonomies used in News.
>
> We would very much welcome your input.
>
> Misha Wolf
> News Standards Manager, Reuters, http://www.reuters.com/
> Vice Chair, News Architecture WP, IPTC, http://www.iptc.org/
>
>
> -----Original Message-----
> From: Booth, David (HP Software - Boston) [mailto:dbooth@hp.com]
> Sent: 06 April 2007 17:12
> To: Misha Wolf; Henry S. Thompson; www-tag@w3.org;
> newsml-g2@yahoogroups.com
> Subject: RE: Towards a TAG consideration of CURIEs
>
>> From: www-tag-request@w3.org [mailto:www-tag-request@w3.org]
>> . . .
>> Henry pointed out at the Edinburgh AC meeting that if we used simple
>> concatenation to give people access to information about terms in
>> our taxonomies, we could end up with illegal fragment IDs.  So:
>>
>> If:
>>    <subject qcode="iptc:123456"/>
>> and if:
>>    iptc -> http://www.iptc.org/NewsCodes#
>> and if we used simple concatenation, we'd get:
>>    iptc -> http://www.iptc.org/NewsCodes#123456
>>
>> There is, of course, the other option:
>>    iptc -> http://www.iptc.org/NewsCodes/
>> then if we used simple concatenation, we'd get:
>>    iptc -> http://www.iptc.org/NewsCodes/123456
>>
>> We've decided to side-step this by specifying that the concatenation
>> rules are taxonomy-specific and are up to the provider of each
>> taxonomy.
>
> So any URI-based program using multiple taxonomies must have special
> concatenation rules built in for *each* taxonomy?  That sounds awful.
> Was there some reason why the group could at least recommend that the
> namespace part end with either "/" or "#" (along with corresponding
> constraints on the local part)?
>
> David Booth, Ph.D.
> HP Software
> +1 617 629 8881 office  |  dbooth@hp.com
> http://www.hp.com/go/software
>
>
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Received on Saturday, 7 April 2007 15:04:16 GMT

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