On Donnerstag, 7. Januar 2010, zehet...@molgen.mpg.de wrote: > Hi, > > wouldn't be [[has type:: List]] most consistent with other types like > String, Number? Or are there other list types than 'Value List' (list of > values) possible (e.g. 'Object List' ...)?
Good point. So my preferred name for now would be "List".
>
>
> What happens in the case of just one field used?
> [[has type:: Value list]]
> [[has fields:: String]]
> Is it equivalent to [[has type:: String]]?
No, it is still a List with one field.
>
>
> In the query example shouldn't
> {{#ask: [[has type::~*;*]] }}
> be
> {{#ask: [[has fields::~*;*]] }}
> ?
Yes, right.
-- Markus
>
> Cheers,
> Gu
>
> P.S.
> Just a thought, for backward compatibility, couldn't SMW if it finds a
> [[has type::]] value string with a ';' in it silently use it as [[has
> fields::]] value and set [[has type::]] to 'Value List' (or whatever name
> is used)?
>
> Quoting Markus Krötzsch <mar...@semantic-mediawiki.org>:
> > The code for n-ary/multivalued has now been changed in SVN, and a new
> > system
> >
> > is in place. This email describes the changes for users, and asks for
> > proposals on how to label some things that users will have to enter. This
> > thread does not discuss the maximal number of fields in a multi-valued
> > property (there is another thread for this).
> >
> >
> > == Changes for the user ==
> >
> > The old way of declaring an n-ary property was to give a type annotation
> > like
> >
> > the following on its property page:
> >
> > [[has type:: String; Number; Page]]
> >
> > This example declares a property that has three fields of the given order
> > and
> >
> > type. The new code requires a modified declaration that contains two
> > annotations:
> >
> > [[has type:: Value list]]
> > [[has fields:: String; Number; Page]]
> >
> > So the type is no longer the list but it has a name, and the list of
> > fields is
> > given in a new property. This change needs to be done to all property
> > pages that use a declaration like the old one above (but please read on
> > before updating from SVN and starting with this change). With the new
> > SMW, you can actually ask for those properties with the query (~ is now
> > enabled by default
> >
> > for all sites):
> >
> > {{#ask: [[has type::~*;*]] }}
> >
> > (Note that types are not stored with their translated labels internally,
> > so ~
> >
> > queries are not likely to be of much use for has_type in general; but it
> > works
> > well enough for the ";" in n-ary types. The fact that this works also
> > illustrates how the new SMW code consistently supports all features in
> > the same way for all properties/datatypes that allow it.)
> >
> >
> > == Call for labels ==
> >
> > Two new labels are used above: "Value list" (the name of the type) and
> > "has fields" (the name of the property for declaring which fields this
> > property has). Both labels are just preliminary and may still be changed.
> > We have already had some history of changing the name of
> > n-ary/multi-valued properties.
> >
> > Technically, the new type is not a "list" (a sequence of arbitrary length
> > with
> > a fixed type) but a "tuple" (like a "pair" but not specifically with 2
> > values). But this term will not be meaningful to most users, so maybe
> > list is
> >
> > not so bad. We can still change it if better proposals are made.
> >
> > Afterwards, we will need translations for the labels so that non-en wikis
> > can
> >
> > use their own language right away, but I will call for this in another
> > email.
> >
> >
> > Cheers,
> >
> > Markus
>
--
Markus Krötzsch <mar...@semantic-mediawiki.org>
* Personal page: http://korrekt.org
* Semantic MediaWiki: http://semantic-mediawiki.org
* Semantic Web textbook: http://semantic-web-book.org
--
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