What a relief to see this discussion... I have been worrying about this and
would be so grateful for a solution. The use of 'multiple' on forms brings
this difficultly into sharp focus.
Alex
On Fri, Jan 23, 2009 at 2:55 AM, Patrick Nagel <m...@patrick-nagel.net>wrote:
> Hi,
>
> the following parts of this discussion make it clear once again, that
> actually
> usable many-valued properties are an important feature. The lack of it
> causes
> great trouble for a lot of SMW users.
>
> > Dan Bolser wrote:
> [...]
> > > If I have several 'semantic' template calls on a page, like:
> > >
> > > {{car | id=1 | color=red | speed=fast }}
> > > {{car | id=2 | color=blue | speed=fast }}
> > > {{car | id=3 | color=red | speed=slow }}
> > > {{car | id=4 | color=pink | speed=fast }}
> [...]
> > > How do I actually get back the fact that car ID=4 is pink and
> fast?
> > > And can I do that in a table for each car without putting the
> > > information across several pages (one page per car)?
>
> > On Thu, Jan 22, 2009 at 9:22 AM, Temlakos <temla...@gmail.com
> > <mailto:temla...@gmail.com>> wrote:
> [...]
> > Now I don't pretend to understand N-ary properties--how to annotate
> > them, or how to query them. I suspect, but cannot prove, that the
> answer
> > to your problem might lie in defining a car as an N-ary property of
> the
> > article. In that way, you'd have four cars, each with its own unique
> > combination of ID, color, and speed attributes. But I have never
> once
> > figured out how to define, annotate, and query an N-ary property.
> >
> > Which also goes to show the number-one failing of the Semantic
> MediaWiki
> > project: /Lack of adequate documentation/.
> [...]
>
> On 2009-01-22 23:12, Yaron Koren wrote:
> [...]
> > I don't understand the tone - as far as I know, no one on this list has
> > ever just told anyone "read the manual". In any case, the reason you
> > haven't been able to find any documentation on n-ary relations is that
> > they're not supported in Semantic MediaWiki (though I hope they will be
> > some day). What is supported are many-valued properties:
> >
> > http://semantic-mediawiki.org/wiki/Help:Many-valued_properties
> >
> > These are similar to n-ary relations, although with a few key
> > weaknesses: one can't separate out the values for display in a query, so
> > that showing the results in separate columns of a table won't be
> > possible. Also, none of the values in the property can be enumerations,
> > i.e. with a limited set of allowed values. But Dan - it should be
> > possible to at least get all the correct data to show up in a query;
> [...]
>
> please, SMW developers, make this a priority :)
>
> Patrick.
>
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