- From: Leonard Will <L.Will@willpowerinfo.co.uk>
- Date: Fri, 6 Jun 2008 16:42:01 +0100
- To: public-esw-thes@w3.org
On Fri, 6 Jun 2008 at 11:06:14, Simon Spero <ses@unc.edu> wrote >On Fri, Jun 6, 2008 at 10:20 AM, Leonard Will <L.Will@willpowerinfo.co.uk> >wrote: >> >> >> True, which is why the document should be indexed with the most specific >> term. >> >> [...]. The search system should be able to distinguish between searches for >> items indexed with the term "animals" and searches for items indexed by the >> term "animals" or any of its narrower terms. This is a function of the >> search system, though, and does not require any special provision in the >> thesaurus structure. >> >> The indexing term "animals" would be assigned to documents which either >> >> a. Deal with animals in general >> b. Deal with several types of animal, too many to index individually >> c. Deal with a type of animal for which no more specific term exists in the >> thesaurus. > > >The only requirement placed on the syndetic structure is support for > hierarchical relationships between terms such that the narrower term is a >proper subset of the broader one; otherwise upward posting and the rule of >three (for suitable values of three) don't work, and the use of specific >terms will cause recall to drop. Unfortunately, SKOS as it now stands >doesn't support this kind of relationship. Simon - Are you saying that SKOS doesn't support hierarchical relationships between terms such that the narrower term is a proper subset of the broader one? Is that just because it allows "broader" to include partitive and instantial relationships as well as generic? If the thesaurus standards are followed, "broader/narrower" should be used for part/whole relationships in only a few specific cases. If "instances" are accepted in the thesaurus I don't think they violate the requirement if they are considered to be "classes of one". I suspect that problems in this area are more likely to arise from people creating inappropriate BT/NT links between concepts than from the format, SKOS or anything else, that is used to encode these relationships. 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 Friday, 6 June 2008 15:43:04 UTC