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RE: Short briefing/background doc't regarding RDFa, prefixes and HTML

From: <Misha.Wolf@thomsonreuters.com>
Date: Thu, 3 Feb 2011 21:17:36 +0000
To: <nrm@arcanedomain.com>, <ht@inf.ed.ac.uk>, <www-tag@w3.org>
CC: <newsml-g2@yahoogroups.com>
Message-ID: <A29ADE959C70A1449470AA9A212F5D801258A9A1@LONSMSXM06.emea.ime.reuters.com>
The overview [1] of NewsCodes on the IPTC Web site includes the 
definition:

QCode:
A special IPTC format to express the code of a concept which was 
introduced with the family of G2-Standards.  Typical for the format 
is having a string, then a colon, and finally another string.  As 
the G2-Standards require to have potentially long strings as 
globally unique identifiers the major goal of QCodes are to shorten 
them and to make the controlled vocabulary visible this code 
pertains to.  The format of a QCode is in short: "short name for the 
controlled vocabulary":"code of the concept" like e.g. subj:06011000

The IPTC Web site contains lots of News taxonomies agreed by IPTC 
members [2].  These can be retrieved in any of the formats:
-  NewsML 1 TopicSet
-  NewsML G2 KnowledgeItem
-  RDF/XML using SKOS
-  RDF/Turtle using SKOS

An example are the IPTC Media Topic NewsCodes [3], a new 1100-term 
taxonomy for categorizing news content.  For example:

   Name      : arts, culture and entertainment
   Definition: Matters pertaining to the advancement and refinement 
               of the human mind, of interests, skills, tastes and 
               emotions
   QCode     : medtop:01000000
   URI       : http://cv.iptc.org/newscodes/mediatopic/01000000

Here we see the concatenation mechanism in action:
   "http://cv.iptc.org/newscodes/mediatopic/" & "01000000" ->
   "http://cv.iptc.org/newscodes/mediatopic/01000000"

A catalog is used to associate each scheme URI with an alias (the 
left-hand side of the QCode).  The current IPTC catalog is available 
at [4].

There's lots more in the G2-Standards Implementation Guide [5].

My presentation to the W3C AC on this subject is available at [6].

[1] http://www.iptc.org/site/NewsCodes/Overview/
[2] http://www.iptc.org/site/NewsCodes/View_NewsCodes/
[3] http://cv.iptc.org/newscodes/mediatopic/
[4] http://www.iptc.org/std/catalog/catalog.IPTC-G2-Standards_14.xml
[5]
http://www.iptc.org/std/NAR/1.5/documentation/IPTC-G2-Implementation-Gui
de_2.zip
[6] http://lists.w3.org/Archives/Public/www-tag/2006May/0048.html

Misha

-----Original Message-----
From: Noah Mendelsohn [mailto:nrm@arcanedomain.com] 
Sent: 03 February 2011 16:42
To: Henry S. Thompson
Cc: Wolf, Misha (M Cont Ent); www-tag@w3.org
Subject: Re: Short briefing/background doc't regarding RDFa, prefixes
and HTML

On 2/3/2011 4:59 AM, Henry S. Thompson wrote:
> A brief summary of how this works, with an example or two, would be
> very welcome, please.

Indeed. I should acknowledge that, long ago, Misha joined us at a
meeting, 
and I'm fairly sure he did explain QCodes in detail then.  I confess I 
don't have the time just now to find the record of that, we've had some 
turnover in TAG membership since then, so brief reminder would indeed be

much appreciated.  Thank you.

Noah



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