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RE: XG Talk during the W3C Advisory Committee Meeting -- IPTC andCURIEs

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  • Misha Wolf
    [Apologies for the earlier typo in the name of the yahoogroup] Hi Raphaël, ... That s good. The main differences are ... CURIEs (as I understand them) are a
    Message 1 of 1 , May 8 9:05 AM
      [Apologies for the earlier typo in the name of the yahoogroup]

      Hi Raphaël,

      > > The new generation of IPTC standards is based on
      > > the use of Qualified Codes (QCodes) which are very different
      > > from CURIEs. Confusion between the two doesn't do anyone any
      > > good.
      >
      > I agree and I'm even now writing some text for highlighting the
      > differences :-)

      That's good. The main differences are ...

      CURIEs (as I understand them) are a mechanism for abbbreviating URIs
      by splitting the URI at an arbitrary point into two parts,
      associating the left part with an alias and then writing (I don't
      know the current syntax), something like:

      alias:right/hand/side

      For example, the URI:

      http://www.w3.org/2005/Incubator/mmsem/

      could be written as any of these:

      x:/

      x:sem/

      x:mmsem/

      x:/mmsem/

      x:bator/mmsem/

      x:Incubator/mmsem/

      etc

      QCodes, on the other hand, are very much like QNames. A QCode is a
      tuple, made up of:

      a scheme URI, mapped to a scheme alias

      a code

      So this could be a legal QCode:

      Scheme = http://www.iptc.org/NewsCodes/Subject/ -> "ncs"

      Code = 17003001 ("weather news")

      QCode = ncs:17003001

      These, however, would *not* be legal QCodes:

      ncs:Subject/17003001

      ncs:Codes/Subject/17003001

      ncs:NewsCodes/Subject/17003001

      etc

      Unlike both QNames and CURIEs, QCodes require that both the scheme
      URI and the code URI be dereferenceable.

      Misha Wolf
      News Standards Manager, Reuters
      Chair, News Metadata Framework WG, IPTC

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