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RE: Supporting arrays of concepts : node labels

From: Miles, AJ (Alistair) <A.J.Miles@rl.ac.uk>
Date: Thu, 6 May 2004 16:18:13 +0100
Message-ID: <350DC7048372D31197F200902773DF4C04944288@exchange11.rl.ac.uk>
To: 'Leonard Will' <L.Will@willpowerinfo.co.uk>, "'public-esw-thes@w3.org'" <public-esw-thes@w3.org>

Hi Leonard,

Thanks for this, yes I was intended the skos:Array construct to cover your
scenario 1 only, i.e. an array of concepts ordered according to some
characteristic of division. 

I think scenario 2 should be handled differently, though I'm not sure how
yet.

Al.

> -----Original Message-----
> From: public-esw-thes-request@w3.org
> [mailto:public-esw-thes-request@w3.org]On Behalf Of Leonard Will
> Sent: 06 May 2004 15:47
> To: 'public-esw-thes@w3.org'
> Subject: Supporting arrays of concepts : node labels
> 
> 
> 
> In message
> <B56ABE145BEB0C40A265238FCAA420DF01DC8E58@oa2-server.oa.oclc.org> on
> Wed, 5 May 2004, "Houghton,Andrew" <houghtoa@oclc.org> wrote
> >
> >> From: Miles, AJ (Alistair) [mailto:A.J.Miles@rl.ac.uk]
> >> Sent: Wednesday, May 05, 2004 2:21 PM
> >> Subject: Supporting arrays of concepts
> >>
> >>
> >> This is a strawman proposal for addition to the SKOS-Core schema:
> >>
> >> Some thesauri group concepts into ordered arrays, and label
> >> the array, e.g.
> >>
> >>      People
> >>                <people by age>
> >>                Children (0-12 years)
> >>                Teenagers (13-19 years)
> >>                Adults (over 20 years)
> >>
> >> Since this sort of thing is common practise, and I believe 
>  will be a part of
> >>the new British standard for thesauri  (Leonard, Stella?), 
> I thought we
> >>ought to come up with a  mechanism for representing it as 
> part of the
> >>SKOS-Core vocab.
> 
> Yes, it is in the draft of the new standard. It would be good to have
> software to handle it properly, as most existing packages are weak in
> this area.
> 
> >> The problem is the best way to represent an ordered list 
> in  RDF.  The
> >>consensus so far seems to be for using RDF Lists  
> (collections).  The
> >>other problem is how to connect an array  to the parent 
> concept.  Such a
> >>connection cannot replace the  skos:broader statements from 
> the array
> >>members, and must be  synchronised with them.
> 
> >This seems like what is called Node Labels and used by AAT and Dewey.
> >Node Labels can be thought of as concepts that participate in the
> >hierarchy structure but cannot be assigned as concepts.  In 
> Dewey, for
> >example, it has the notion of centered entries.  If you look 
> at the printed
> >edition these have a > (greater than sign) preceeding the 
> class span.  You
> >cannot assign them as a class number but they are present for the
> >purposes of grouping the hierarchy, as in your example.  Node Labels
> >have all the same relationships as concepts do, so many 
> times they are
> >represented as concepts.
> 
> Unfortunately, the expression "node label" has been used to mean
> different things in different places. They should not be thought of as
> concepts, because they do not represent concepts, and they do not have
> scope notes or  any of the normal thesaurus relationships. When using
> software that does not make proper provision for node labels it is
> sometime necessary to treat them as concepts and give them BT/NT
> relationships in order to display them in the proper place in a
> hierarchy, but this is a fudge.
> 
> The AAT uses the expression "guide terms" rather than node labels, and
> includes in this not only real node labels (as described at 1 
> below) but
> also terms which represent real concepts but which it thinks are
> inappropriate for use as indexing terms. This is confusing and
> misleading; I think that any term used to describe a concept should be
> potentially usable in indexing, though it can have the note 
> "use a more
> specific concept if possible".
> 
> In the draft British Standard we propose that there should be 
> two kinds
> of node label:
> 
> 1. A node label showing a "characteristic of division". This 
> is the kind
> shown in the example above, and each label contains the word "by"
> followed by the characteristic by which the elements of the following
> array are distinguished. There may be several arrays under any term,
> each introduced by a separate node label, e.g.
> 
>       people
>           <people by age>
>               children (0-12 years)
>               teenagers (13-19 years)
>               adults (over 20 years)
> 
>           <people by occupation>
>           builders
>           bus drivers
>           information technologists
>           information scientists
>           librarians
> 
>           <people by sex>
>           male people
>               men
>               boys
>           female people
>               women
>               girls
> 
> and so on.
> 
> 2. In a display of a classification, rather than a thesaurus, node
> labels are used to show where a change of facet occurs, 
> especially when
> terms from different facets are being combined. They make it 
> clear that
> the relationship between the terms preceding and following the node
> label is not BT/NT, but that the following classes are a 
> compound of the
> subsequent concepts with the preceding concept. In the following
> example, the node labels containing the names of facets are given in
> parentheses:
> 
> (organisms)
> mammals [in general]
>       carnivores [in general]
>           leopards
>           lions
>           tigers
>       herbivores [in general]
>           cattle
>           sheep
> (processes)
>       physiological processes [in general]
>           digestion [in general]
>               (organisms)
>               [digestion in] carnivores
>                   [digestion in] lions
>               [digestion in] herbivores
>                   [digestion in] cattle
>                   [digestion in] sheep
>           respiration [in general]
>               (organisms)
>               [respiration in] lions
> 
> The words in square brackets in this example are often omitted in
> classification schedules, being implied by the indentation or
> typography.
> 
> I take it that at the moment you are just addressing the issue of node
> labels of type 1.
> 
> >SKOS currently doesn't take Node Label's into account with 
> it's prefLabel
> >and altLabel elements.  It is possible that a Node Label 
> could have many
> >different altLabel's.  I don't think that you need to add 
> additional structure
> >to represent Node Labels.  Perhaps, what is needed is to say that a
> >concept must have either a group of prefLabel elements 
> (xml:lang'ed) or a
> >group of nodeLabel elements (xml:lang'ed) and can have any number of
> >altLabel elements.  Since Node Labels will also have BT, NT, RT
> >relationships, you will not need to duplicate that structure 
> by reusing
> >skos:Concept.
> 
> How this is implemented technically I'll leave to someone else, but I
> think you have to be careful and not accept this paragraph 
> literally (at
> least if you accept our definition of node labels). As a node label is
> not a label for a concept, there is no underlying concept to which
> altLabels can be applied.
> 
> Node labels do not have BT, NT or RT relationships, except in 
> the fudged
> case I described above to make use of software without the required
> functionality. The BT/NT relationship in effect "jumps over" the node
> label, so that in the first example above the relationship is
> 
> people
> NT    children
>       teenagers
>       adults
>       builders
> 
> etc.,
> 
> and _not_
> 
> people
> NT    <people by age>
> 
> etc.
> 
> Leonard
> -- 
> Willpower Information       (Partners: Dr Leonard D Will, 
> Sheena E Will)
> Information Management Consultants              Tel: +44 
> (0)20 8372 0092
> 27 Calshot Way, Enfield, Middlesex EN2 7BQ, UK. Fax: +44 
> (0)870 051 7276
> L.Will@Willpowerinfo.co.uk               
> Sheena.Will@Willpowerinfo.co.uk
> ---------------- <URL:http://www.willpowerinfo.co.uk/> 
> -----------------
> 
Received on Thursday, 6 May 2004 11:19:03 GMT

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