780RE: [newsml-g2] Properties of a concept
- Dec 23, 2008
The object of a triple is not always a concept (a “resource” in RDF terms). It can be a “literal” value, and this is the case for the number of seats.
To force a literal to be a resource identifier (e.g. facet=”nbseats:83”) is a non-sense for me.
On 23 Dec 2008 at 10:13 Paul Harman wrote:
> From: Michael Steidl (IPTC) [mailto:mdirector@...]
> > This way you could add e.g.
> > <related rel="poiProps:noOfSeats" literal="83" />
> > <related rel="poiProps:operator" qcode="pacompanies:UCI" />
> Hmmm. These two things do not seem to be expressing the same type of
> information. The second I can see as a relatioship between a cinema and
> it's operator - i.e. between two conceptItems, or things that could be
> modelled as conceptItems. However I don't think the number 83 is a
> credible concept - it's rather abstract, evben more som than emotions
> that are represented as concepts for describing images and videos - so
> using related feels wrong to me.
> Darko's suggestion of using facet (which I think may not be valid per
> the specs) feels more 'right' to me. It's a property [or facet] of the
> cinema that it has 83 seats, rather than a relationship between the
> cinema and the number 83 of type 'numberOfSeats'. In NewsML1.x I would
> have modelled this as <Property FormalName="NumberOfSeats" Value="83"/>
> but there doesn't seem to be an equivalent comfortable mechanism here.
<related> has no specific semantics - except that it refers to something with a kind of relationship which is indicated by @rel.
The problem with <facet> is that is has no @literal attribute - thus Darko's proposal does not validate.
In general: all the properties of an item must resolve to an RDF triple (this was an initial business requirement for G2) - subject / predicate / object:
- the subject is always a part of "this" item, that could be the item as a whole or parts of it like a specific rendition, a part of a rendition, e.g. the paragraph of an article.
- the predicate is the semantics of a property. E.g. <subject> translates to a predicate like "isAbout". And at this point all properties with a @rel attribute have a special role: they act as a generic container, the precise predicate is expressed by the value of the @rel. In this sense <related> is the most generic container, while a property like <facet> already scopes the relationships which make sense at this point.
- and finally the object is the value of the property, expressed either as a code from a controlled vocabulary or a literal value
This way one could express a property as an RDF triple in N3 notation as well:
ConceptInThisItem hasNoOfSeats 83 .
ConceptInThisItem hasOperator UCI .
You see, 83 is a valid object of such a triple as UCI is. Therefore I can not agree with you that "83 is not a credible concept".
> (Okay, so POI already has a 'capacity' element, which is great, I'll
> that - but the point generalises).
> Any member of this IPTC moderated Yahoo group must comply with the
> Intellectual Property Policy of the IPTC, available at
> http://www.iptc.org/goto/ipp. Any posting is assumed to be submitted
> under the conditions of this IPTC IP Policy.
> Yahoo! Groups Links
> <*> To visit your group on the web, go to:
> <*> Your email settings:
> Individual Email | Traditional
> <*> To change settings online go to:
> (Yahoo! ID required)
> <*> To change settings via email:
> <*> To unsubscribe from this group, send an email to:
> <*> Your use of Yahoo! Groups is subject to:
Managing Director of the IPTC <mdirector@...>
International Press Telecommunications Council
"Information Technology for News"
Visit us on the web at http://www.iptc.org
This e-mail, and any file transmitted with it, is confidential and intended solely for the use of the individual or entity to whom it is addressed. If you have received this email in error, please contact the sender and delete the email from your system. If you are not the named addressee you should not disseminate, distribute or copy this email. For more information on Agence France-Presse, please visit our web site at http://www.afp.com
- << Previous post in topic