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On 7/11/12 5:39 PM, Chris Menzel wrote:
I discussed
these issues in my 1984 book, my 2000 book, and numerous
papers about how to map language to and from logic. And the
answer
about paradoxes is that you fix them. Database administrators
have
probably faced more such examples than philosophers have dreamed
of.
I highly doubt it.
John,
As you know, modelling the real-world has always been an RDBMS
paradox since RDBMS keys are based on the content of one of more
fields/columns, which is extensional. When an RDBMS (as per ORDBMS
hybrids) support reference values the door is opened up for
intensionality since keys aren't based on record content. Up the
ante by using de-referencable URIs as references in a hybrid DBMS
and you can surmount the real-world modeling paradox.
Links:
1. http://bit.ly/L9VGo3 -- standard RDBMS based SELECT * query.
Green links on the primary key indicate locally de-referencable
identifiers as values
2. http://bit.ly/PN9uv1 -- effect of de-referencing local identifier
3. http://bit.ly/MjviYJ -- alternative intensional view using URIs
(blue links)
4.
http://demo.openlinksw.com/Northwind/customers/CustomerID/ALFKI#this
-- actual URI which is accessible by copying @href which you can
paste as is into any browser.
5. http://bit.ly/N5439N -- SPARQL query emphasizing intensionality
while also demonstrating how real-world modelling paradox is
surmounted via a hybrid DBMS.
--
Regards,
Kingsley Idehen
Founder & CEO
OpenLink Software
Company Web: http://www.openlinksw.com
Personal Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca handle: @kidehen
Google+ Profile: https://plus.google.com/112399767740508618350/about
LinkedIn Profile: http://www.linkedin.com/in/kidehen
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