Excerpts from Nina Jeliazkova's message of Fri Nov 06 19:42:26 +0100 2009:
> Christoph, All,
> 
> Just to note literals for feature values might not be sufficient,
> especially for data mining algorithms. (We had already identified the
> need of data type with a recent discussion with  Tobias and Pantelis ).

I mean literal in the sense of "it is written down" (i.e. it is not a
ressource reference). Of course it is possible to attach
datatypes to literals (as well as to use more complex datatypes than
single values).

Best regards,
Christoph

> 
> There is an extensive support for data types in RDF
> 
> <?xml version="1.0"?>
> 
> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
> 
>          xmlns:ex="http://example.org/stuff/1.0/">
> 
>   <rdf:Description rdf:about="http://example.org/item01">
> 
>     <ex:size
> rdf:datatype="*http://www.w3.org/2001/XMLSchema#int*">123</ex:size>
> 
>   </rdf:Description>
> 
> </rdf:RDF>
> 
> 
>   And the hierarchy of built-in data types according to W3C
>   Recommendation 28 October 2004 за XML Schema Part 2: Datatypes Second
>   Edition at http://www.w3.org/TR/xmlschema-2
> 
> 
> 
> Diagram of built-in type hierarchy
> 
> 
> I'll send another email about feature definitions. If we consider them
> replaced by predicates, these predicates needs still to be defined with
> RDF , including, names, units, authors, references, etc.
> 
> 
> Best regards,
> Nina
> 
> Christoph Helma wrote:
> > Dear all,
> >
> > If we agree on RDF for data exchange, we can write feature values as
> > literals. This would make the feature API obsolete, because
> >
> >     - the feature URI (predicate) substitutes the previous feature-definition
> >     - the feature value (object) substitutes the previous feature
> >
> > The remaining functionality of the original API is covered by the
> > dataset component + RDF. Less is more!
> >
> > Best regards,
> > Christoph
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> >   
>