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   Re: "RDF + Topic Maps" = The Future

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  • From: Jonathan Borden <jborden@mediaone.net>
  • To: Nikita Ogievetsky <nogievet@cogx.com>,Martin Bryan <mtbryan@sgml.u-net.com>, xml-dev@lists.xml.org
  • Date: Mon, 18 Dec 2000 17:17:21 -0500

Nikita Ogievetsky wrote:
> But as far as I know (I might be wrong, please correct me if this is the
> case)
> RDF has no STANDARD! way to carry forward the origin of opinion.

RDF does have a standard way to declare the origin of a statement (presume
an opinion is derived from a statement). This is the distinction between a
statement and stating and is the point of statement "reification". The point
is that since everything is a resource, one can make statements about
statements which is how I assume one might make a statement regarding the
origin of a statement.


<Statement ID="S1">
    <subject resource="#peppers"/>
    <predicate resource="#are" />
    <object resource="#hot" />

<Statement ID="S2">
    <subject resource="#jon">
    <predicate resource="#believes"/>
    <object resource="#S1">

<Statement ID="S3>
    <subject resource="#fred" />
   <predicate resource="#asserts"/>
    <object resource="#xpointer(//Statement[2])">

Which yeilds the following English statements:

"Peppers are hot."
"Jon believes that peppers are hot."
"Fred asserts that Jon believes that peppers are hot."

Jonathan Borden
The Open Healthcare Group


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