RE: XG Talk during the W3C Advisory Committee Meeting -- IPTC andCURIEs
- [Apologies for the earlier typo in the name of the yahoogroup]
> > The new generation of IPTC standards is based onThat's good. The main differences are ...
> > 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 :-)
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:
For example, the URI:
could be written as any of these:
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
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:
Unlike both QNames and CURIEs, QCodes require that both the scheme
URI and the code URI be dereferenceable.
News Standards Manager, Reuters
Chair, News Metadata Framework WG, IPTC
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