[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: A certain difficulty

  • From: David Megginson <david@m...>
  • To: xml-dev@x...
  • Date: 25 Feb 2000 15:14:00 -0500

cartooncreator
Mark Birbeck <Mark.Birbeck@i...> writes:

> Hopefully my example shows that I'm coming at this from the other
> side; *my* creator might be "everyone who has designed a building"
> whilst *my mum's* creator is "everyone who has knitted a jumper".

That's only because you're loading too much meaning into the property
and forgetting about the class of the object it's attached to (Dublin
Core is guilty of the same thing).

> Of course we could say everyone must use "dc:Creator", but then how
> do I find everyone who ever knitted a jumper? Well of course I go to
> the knitting site that has used RDF to refer to subsets of other
> data, because they have a class called "Knitter".

Take a look at the class.  Consider the following:

  <rdf:RDF ...>

  <megg:Jumper rdf:about="http://www.foo.com/1">
    <dc:creator rdf:about="http://www.people.org/a"/>
  </megg:Jumper>

  <megg:Book rdf:about="http://www.amazon.com/ids/00002">
    <dc:creator rdf:about="http://www.people.org/b"/>
  </megg:Book>

  </rdf:RDF>

If you want to find every knitter but not every author, then simply
look only for dc:creator properties attached to an object of class
megg:Jumper.  The alternative is to create an endless stream of new
properties

  create
  sweaterCreator
  bookCreator
  carCreator
  webPageCreator
  cartoonCreator
  flyingSaucerCreator
  emailCreator
  badSmellCreator

etc.  Of course, you have no choice but to do this kind of thing when
you're using flat HTML <meta> tags, but RDF was designed specifically
to allow you to apply modern OO techniques to the problem.


All the best,


David

-- 
David Megginson                 david@m...
           http://www.megginson.com/

***************************************************************************
This is xml-dev, the mailing list for XML developers.
To unsubscribe, mailto:majordomo@x...&BODY=unsubscribe%20xml-dev
List archives are available at http://xml.org/archives/xml-dev/threads.html
***************************************************************************

PURCHASE STYLUS STUDIO ONLINE TODAY!

Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
Email
First Name
Last Name
Company
Subscribe in XML format
RSS 2.0
Atom 0.3
 

Stylus Studio has published XML-DEV in RSS and ATOM formats, enabling users to easily subcribe to the list from their preferred news reader application.


Stylus Studio Sponsored Links are added links designed to provide related and additional information to the visitors of this website. they were not included by the author in the initial post. To view the content without the Sponsor Links please click here.

Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.