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Home -> Community -> Usenet -> comp.databases.theory -> Re: Demo: Modelling Cost of Travel Paths Between Towns
"Neo" <neo55592_at_hotmail.com> skrev i en meddelelse
news:1102382367.430021.160210_at_z14g2000cwz.googlegroups.com...
> Assumming all produce and medicine are products, which of the below two
> "hierarchies" below would be most appropriate?
>
> thing
> __inst: product
> ____inst: carrot
> ____inst: asprin
> ____inst: garlic
> ____inst: widget1
> __inst: produce
> ____inst: carrot
> ____inst: garlic
> __inst: medicine
> ____inst: asprin
> ____inst: garlic
>
> dir
> __entry: product
> ____inst: widget1
> ____subCls: produce
> _______inst: carrot
> _______inst: garlic
> ____subCls: medicine
> _______inst: aspirin
> _______inst: garlic
>
> Notes:
> dir is an abbreviation for directory or catalog.
> cls/inst is abbr for class/instance.
> subCls/superCls is abbr for subClass/superClass.
If relevant, plz start a new thread - or better. don't .... Received on Tue Dec 07 2004 - 08:23:09 CST
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