Property talk:From

How should this be made into RDF? I think one possibility might be to use RDF reification to make the statement "Bill Clinton was president of USA" into a resource so that "to date" and "from date" attributes could be used on it. Fuelbottle 02:19, 22 November 2005 (CET)

I think on something like this:

<rdf:about rdf:resource="Bill Clinton">
  <Attribute:from_date>20/1/1993</Attribute:from_date>
  <Attribute:to_date>20/1/2001</Attribute:to_date>
  <Relation:was_president_of rdf:resource="USA" />
</rdf:about>

This should be a fitting representation of the statement

[[{from date:=20/1/1993}{to date:=20/1/2001}{was president of::USA}]]

Maybe you find a better representation - but this one should work.

Note: A space is not allowed as qualified Name of XML-Elements. Technically speaking, %20 might be a better representation than an underscore.

MovGP0 03:49, 22 November 2005 (CET)

To my knowledge, the statement about the resource "Bill Clinton" above expands to the following triples:

"Bill Clinton" attribute:from_date "20/1/1993"
"Bill Clinton" attribute:to_date "20/1/2001"
"Bill Clinton" Relation:was_president_of rdf:resource="USA"

which is certainly not what we wanted to encode, because the relationship among the dates and the precidency got lost. I am quite sure that this is not what was intended, and probably, I misunderstood some idea. Nevertheless there is a straightforward and clean way to encode this information by the introduction of new vocabulary, such as "US-presidency".

www.wikipedia.org/BC-presidency rdfs:type-of www.wikipedia.org/terms/US-presidency
www.wikipedia.org/terms/BC-presidency www.wikipedia.org/terms/Presidency_president www.wikipedia.org/terms/Persons/Bill_Clinton
www.wikipedia.org/terms/BC-presidency www.wikipedia.org/terms/Presidency_start "20/1/1993"
www.wikipedia.org/terms/BC-presidency www.wikipedia.org/terms/Presidency_end "20/1/2001"

In this way, we associated the URI representing Bill Clinton with a URI for his precidency, and the start and the end of his presidency have been stated. Sure, additional vocabulary had to be introduced, but also us humans know that the US-presidency and the UN-presidency are different concepts.

RDFS can be used to state that the US-presidency is a subproperty of presidency:

www.wikipedia.org/terms/US-presidency rdfs:subproperty www.wikipedia.org/terms/presidency