RE: [newsml-g2] Properties of a concept
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).
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