Re: Nested facets

Claudio,

In that system, how would you apply two common subdivisions to the same 
class heading?

e.g.

>-782            Nebraska
>3729            Elementary education in particular regions
>3729782 Elementary education in Nebraska
-45     English language
??????? Elementary education about English language in Nebraska

What would identify the last line? And is order significant? -- would there 
be a distinction between these two things:

    Elementary education about (English language in Nebraska)

and

    (Elementary education about English language) in Nebraska

?

-trav

At 08:42 AM 4/29/2004, you wrote:
>""" [Peter van Dijck]
>I wrote about the concept of "nested facets" here:
>http://poorbuthappy.com/ease/archives/002793.html
>[...]  I'm looking to see if this concept of nested facets has
>been described/discussed elsewhere (in the LIS community?),
>probably using other terms...
>"""
>
>Peter,
>
>something very similar to your idea exists indeed in general
>bibliographic classifications, both faceted and non-faceted:
>it is usually called _common subdivisions_, or
>_common auxiliaries_, or even _common isolates_.
>
>For example, Dewey Decimal Classification has tables
>of common subdivisions for places, historical periods,
>person categories, languages, and so on, which can be attached
>to many different classes within different disciplines
>(see EG <http://www-class.unl.edu/curr921b/contents5.htm>):
>
>-782            Nebraska
>
>3729            Elementary education in particular regions
>3729782 Elementary education in Nebraska
>
>91(0)           Geography
>91782           Geography of Nebraska
>
>Please notice that DDC is not a faceted classification:
>common subdivisions are not a feature exclusive of FCs,
>hence a librarian would not call them "facets".
>I agree, however, that they are used in a way similar
>to facets, and maybe can be seen as a first step towards
>the idea of FC, namely of concept combinability, which
>was developed later (since 1920s) in library science.
>
>Faceted classification systems, like BC2, have both common
>subdivisions and facets. The main difference is that facets
>are limited to a specific discipline -- EG "habitat" is only
>a facet within zoology -- while common subdivisions can
>be applied across disciplines, as in the example above
>with education and geography.
>
>Hope this helps...



----------
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