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Re: longdesc URLs and RDFa

From: Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no>
Date: Sun, 15 Aug 2010 18:50:41 +0200
To: Mark Birbeck <mark.birbeck@webbackplane.com>
Cc: Ivan Herman <ivan@w3.org>, Shane McCarron <shane@aptest.com>, public-rdfa-wg@w3.org
Message-ID: <20100815185041803937.64c8272b@xn--mlform-iua.no>
Hi Mark,

Mark Birbeck, Sun, 15 Aug 2010 15:35:17 +0100:
>> The RDFa syntax spec has a blockquote example,
>> http://www.w3.org/MarkUp/2010/ED-rdfa-syntax-20100113/#sec_6.3.2.1.
>> <blockquote id="q1" cite="urn:ISBN:0140449132" >
>> should generate the same triples.
> There's nothing wrong with @cite generating a predicate, and indeed
> this featured in some of the early RDFa work. (It was dropped more
> because of time constraints than anything to do with the feature
> itself.)

Good. Ivan asked for clear use cases.
> However, @id does not automatically generate a URI, and there are good
> reasons for not doing so. In other words, these two sets of markup
> will both genereate the same triples, with <#q1> as the subject:
>   <blockquote id="q1" about="#q1" rel="cite" resource="urn:ISBN:0140449132">
>   <blockquote about="#q1" rel="cite" resource="urn:ISBN:0140449132">
> I.e., the @id is irrelevant.

OK. So the @about points to the @id - wherever it is. (Had I tested 
that example as written, then I would of course have seen that it did 
not work ...)

There might still be errors in the example, but please then assume that 
I meant that the following blockquotes should lead to the same triples:

<blockquote id="q1" about="#q1" rel="cite" 
<blockquote id="q1" about="#q1" cite="urn:ISBN:0140449132" /> 

Btw, I think the blockquote example in the draft doesn't make sense - 
from an HTML point of view. I would expect the entire <blockquote> 
element to constitute the quote, whereas in the example, then only the 
<p> element is linked to the ISBN resource. What if the example in the 
draft contained more than one paragraphs? Then only the first paragraph 
would stemming from ISBN 0140449132. I hope this rewrite of the example 
shows the problem:

<blockquote about="#q1" rel="dc:source" resource="urn:ISBN:0140449132" >
    <p id="q1">Rodion Romanovitch! My dear friend! </p>
    <p>If you go on in this way you will go mad, </p>
    <p>I am positive! Drink, pray, if only a few drops!</p> 

I think the example in the spec is meant to demonstrate how @about and 
@id relate to each other. However, I think you evetnually should find 
another way to demonstrate that relationship.

> Similarly, both of these have bnodes for their subjects:
>   <blockquote id="q1" rel="cite" resource="urn:ISBN:0140449132">
>   <blockquote rel="cite" resource="urn:ISBN:0140449132">
> Once again, the @id is irrelevant.


>> So, perhaps one of the first things that should be done would be to add
>> @longdesc to the XHTML vocab profile so that one do the same for
>> @longdesc.
> I'll leave that discussion to another thread -- I just wanted to
> quickly clarify the situation with relation to @id.

OK. Thanks. Whichever thread you want. :-)
leif halvard silli
Received on Sunday, 15 August 2010 16:51:17 UTC

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