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Re: better support for bnodes

From: Ben Adida <ben@mit.edu>
Date: Sun, 08 Oct 2006 17:27:43 -0400
Message-ID: <45296D4F.3040601@mit.edu>
To: public-rdf-in-xhtml-tf@w3.org


Whoops, I used SPANs where I should have used METAs.

Let's try this one again:

===================

<div about="[:DJDKWBDADIH05]" class="bibtex:Article">
<span property="bibtex:title">Do you see what I mean?</span>

<ol rel="bibtex:author">
  <li><meta property="foaf:name">David J Duke</meta></li>
  <li><meta property="foaf:name">Ken W Brodlie</meta></li>
  <li><meta property="foaf:name">David J Duce</meta></li>
  <li><meta property="foaf:name">Ivan Herman</meta></li>
</ol>

<p rel="bibtex:journal">
  <meta property="bibtex:name">IEEE Computer Graphics &amp;
Application</meta>
</p>

<span property="bibtex:volume">25</span>
<span property="bibtex:number">3</span>

<p rel="bibtex:date">
  <meta property="bibtex:month" content="3">March</meta>
  <meta property="bibtex:year">2005</meta>
</p>

<p rel="bibtex:page">
  <meta property="bibtex:startPage">6</meta>
  --
  <meta property="bibtex:endPage">9</meta>
</p>

</div>

====================


Now, since we've received criticism for overruse of META and LINK, we
could push this a little bit further and say that, if a REL exists on an
element without an HREF, then the bnode is created *and* an implicit
about=self is also added, so that you can use span and other elements
instead of LINK and META only inside that element.

This is particularly interesting given that LINK and META are going to
be difficult to use in the body of documents with current browsers...

-Ben

Ben Adida wrote:
> 
> A followup on Mark's proposed solution to make it easier to have bnodes.
> Short version: I really like it.
> 
> Let's see if I can summarize the proposal: if @rel is present on an
> element without @href, then the element itself becomes the object of the
> triple. Thus, if the element has an @id, then the object is this named
> ID, but, if it doesn't, a bnode id gets generated and that's the object.
> 
> I don't mind the wrinkle Mark brought up about possibly orphaned bnodes
> if an @href is later added.
> 
> I now wonder if this can be extended to @rev. In other words, if @rev is
> present without an @href, then the *subject* of the triple is the
> current element, and the object is resolved using the normal upwards
> traversal to find an about. Are there wrinkles here that I'm not seeing?
> 
> Next, let's look at RDF containers. What if we wanted to have a list of
> authors for a page? I like the following syntax:
> 
> <ul rel="dc:creator">
> <li>Mark Birbeck</li>
> <li>Ivan Herman</li>
> </ul>
> 
> and this would exactly parse as expected using Mark's proposal and the
> existing RDFa Containers proposal [1]:
> 
> _:ul0 rdf:type rdf:Bag .
> _:ul_0 rdf:_1 "Mark Birbeck" .
> _:ul_0 rdf:_2 "Ivan Herman" .
> 
> "" dc:creator _:ul0 .
> 
> This is looking promising!
> 
> Now, let's take a look at the entire Turtle example provided by Ivan and
> try to write it up using Mark's proposal:
> 
> ===================
> 
> <div about="[:DJDKWBDADIH05]" class="bibtex:Article">
> <span property="bibtex:title">Do you see what I mean?</span>
> 
> <ol rel="bibtex:author">
>   <li><span property="foaf:name">David J Duke</span></li>
>   <li><span property="foaf:name">Ken W Brodlie</span></li>
>   <li><span property="foaf:name">David J Duce</span></li>
>   <li><span property="foaf:name">Ivan Herman</span></li>
> </ol>
> 
> <p rel="bibtex:journal">
>   <span property="bibtex:name">IEEE Computer Graphics &amp;
> Application</span>
> </p>
> 
> <span property="bibtex:volume">25</span>
> <span property="bibtex:number">3</span>
> 
> <p rel="bibtex:date">
>   <span property="bibtex:month" content="3">March</span>
>   <span property="bibtex:year">2005</span>
> </p>
> 
> <p rel="bibtex:page">
>   <span property="bibtex:startPage">6</span>
>   --
>   <span property="bibtex:endPage">9</span>
> </p>
> 
> </div>
> 
> ====================
> 
> 
> I'd say that's starting to look quite nice!
> 
> 
> -Ben
> 
> 
> [1] http://www.w3.org/2001/sw/BestPractices/HTML/2006-rdfa-containers
> 
Received on Sunday, 8 October 2006 21:27:53 GMT

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