You are right: mandatory means that only this CV has to be used with a
property - in this case a concept from the Nature of a NewsItem with the
itemClass property of any G2 NewsItem.
The reason is interoperability. IPTC standards are made to ease the exchange
of news (and related content) and one of the goals for G2 is that a receiver
of NewsItems from different providers gets something very, very similar.
The members of the Nature of a NewsItem CV have been extensively discussed
by the members of the IPTC G2 development group and they reflect what is
currently out on the market, I have to admit we did not encounter
holographic four dimensional odorant content so far.
As I know that you are working of an IPTC member I can only remind you and
that member that if something beyond the current specifications is required
then a change request should be posted, then it will be discussed and
finally voted on. That's the way how IPTC standards are maintained.
Managing Director of the IPTC [mdirector@...
International Press Telecommunications Council
Web: www.iptc.org - on Twitter @IPTC
Business office address:
20 Garrick Street, London WC2E 9BT, United Kingdom
Registered in England, company no 101096
> -----Original Message-----
> From: firstname.lastname@example.org [mailto:newsml-
> email@example.com] On Behalf Of Philippe Mougin
> Sent: Tuesday, November 29, 2011 6:32 PM
> To: firstname.lastname@example.org
> Subject: [newsml-g2] What does "mandatory scheme" means and how to
> deal with need for extension?
> In the spec, I see that some schemes are specified as "mandatory" for some
> QCodes-based attributes. For example, for new items, the scheme
> http://cv.iptc.org/newscodes/ninature is specified as mandatory for the
> qcode attribute of the itemClass element.
> Does the "mandatory" word here means that I must not use another scheme
> (e.g. a second scheme of my own creation)? If so, how would you approach
> my need to characterize a document with a nature of document which isn't
> yet supported by the scheme (e.g., an holographic four dimensional odorant
> document) and that must be processed by a dedicated workflow?
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