RDF has two ways to handle this. I don't think SMW supports either in a direct way. 1. Blank nodes. Instead of a property having a value of type integer, it has a value of a composite type that has an integer, date, etc. Since it is a "blank node" you don't need to create a unique URI for it (or its own page in SMW). "Blank nodes" are used in RDF all the time, for example as the nodes in a list, or to mention "the person that has email address [EMAIL PROTECTED]" without needing to give that object its own unique identifier, and also to make "composite types" like the date/integer you mention. 2. Reification. If your statement is "San Francisco has population 739426", then you make a separate object of type Statement where the subject is "San Francisco", the predicate is "has population" and the object is "739426". Then you can extend this to say "this statement" is true on the date 2005. (Since the Statement object is usually a blank node, it kind of amounts to the same as option 1.)
The closest thing I see in in SWM is Type:Geographic coordinate which is basically a blank node with a latitude and longitude property. Are there any plans in SMW to support blank nodes, custom composite types, or reification? - Jeff Harold Solbrig wrote: > Dan, > > > > Why just integers? It would seem like it would be useful to be able to add > provenance (who, when, where…) information to any property – not just integers. President:=Johnson - 1965 or hasChild :: Sarah – 2003 definedIn:=http://w3.org/sample/prelimVersion 2007-08-07 > > > > Harold Solbrig > > > > ------------------------------------------------------------------------ > > *From:* [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] *On Behalf Of *Dan Thomas > *Sent:* Saturday, September 08, 2007 7:24 AM > *To:* Semediawiki-devel@lists.sourceforge.net > *Subject:* [SMW-devel] dated integer type > > > > I have run across a concept called 'dated integer' that I propose become a > native SMW data type. As the name implies, one can associate a number with a year: > > population:=9,999 - 2005 or > homeruns:=756 - 2007-08-07. > > Do others think this would be useful? > > -- > -- > Dan Thomas ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Semediawiki-devel mailing list Semediawiki-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/semediawiki-devel
