RE: Arrays in SKOS: proposal

Hi Andy,

We are using RDF Collections here - the skos:members property should be used
exactly as in the #students property in the example at [1].

So a SKOS e.g. in RDF/XML ...

<skos:Concept rdf:about="URI_X">
	<skos:prefLabel>Aircraft</skos:prefLabel>
	<skos:array>
		<skos:Array>
			<rdfs:label>Aircraft by form</rdfs:label>
			<skos:members rdf:parseType="Collection">
				<skos:Concept rdf:about="URI_A"/>
				<skos:Concept rdf:about="URI_B"/>
<skos:Concept rdf:about="URI_C"/>
</skos:members>
		</skos:Array>
	</skos:array>
	<skos:narrower rdf:resource="URI_A"/>
	<skos:narrower rdf:resource="URI_B"/>	
	<skos:narrower rdf:resource="URI_C"/>
</skos:Concept>

<skos:Concept rdf:about="URI_A"/>
	<skos:prefLabel>Flying bomb</skos:prefLabel>
	<skos:broader rdf:resource="URI_X"/>
</skos:Concept>

<skos:Concept rdf:about="URI_B"/>
	<skos:prefLabel>Seaplane</skos:prefLabel>
	<skos:broader rdf:resource="URI_X"/>
</skos:Concept>

<skos:Concept rdf:about="URI_C"/>
	<skos:prefLabel>Monoplane</skos:prefLabel>
	<skos:broader rdf:resource="URI_X"/>
</skos:Concept>

Al.

[1] http://www.w3.org/TR/rdf-primer/#collections    



---
Alistair Miles
Research Associate
CCLRC - Rutherford Appleton Laboratory
Building R1 Room 1.60
Fermi Avenue
Chilton
Didcot
Oxfordshire OX11 0QX
United Kingdom
Email:        a.j.miles@rl.ac.uk
Tel: +44 (0)1235 445440



> -----Original Message-----
> From: public-esw-thes-request@w3.org
> [mailto:public-esw-thes-request@w3.org]On Behalf Of Houghton,Andrew
> Sent: 13 May 2004 17:11
> To: 'public-esw-thes@w3.org'
> Subject: RE: Arrays in SKOS: proposal
> 
> 
> 
> > From: Miles, AJ (Alistair) [mailto:A.J.Miles@rl.ac.uk] 
> > Sent: Thursday, May 13, 2004 11:41 AM
> > Subject: Arrays in SKOS: proposal
> > 
> > By default, without using arrays, the ordering of narrower 
> > concepts is not preserved by RDF applications.  Therefore, in 
> > any situation where the ordering of a set of concepts is 
> > significant, an array should be used to express that 
> > ordering.  The array may be given a label, but this is not 
> necessary.
> > 
> > The skos:Array construct is recommended for encoding the 
> > grouping of a set of concepts according to some 
> > 'characteristic of division'.  In the majority of cases of 
> > the use of characteristics of division, the ordering is 
> > signficant.  Applications handling a skos:Array should treat 
> > the ordering as significant by default.  
> > 
> > However, in some cases the ordering of concepts under a 
> > characteristic of division is not significant.  It is 
> > recommended that a SKOS encoding of a thesaurus does not 
> > introduce ordering information where such information was not 
> > a part of the original thesaurus.  In these cases, the fact 
> > that the ordering is irrelevant should be expressed by adding a
> > (skos:ordered,'false') property to the array.
> > 
> 
> I'm not clear as to why RDF collections were not used vs. the
> skos:ordered property.  It seems to me that whether there is
> ordering or not maps onto rdf:Bag and rdf:Seq which are both
> collections.  If you didn't want to use rdf:Bag and rdf:Seq
> you could develop the appropriate SKOS representation and
> mark them in the RDFS as collections.  Can you clarify why
> RDF collections are not being used?
> 
> 
> Thanks, Andy.
> 
> Andrew Houghton, OCLC Online Computer Library Center, Inc.
> http://www.oclc.org/about/
> http://www.oclc.org/research/staff/houghton.htm
>

Received on Thursday, 13 May 2004 14:13:58 UTC