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Re: Different treatment of @resource between RDFa 1.0 and 1.1

From: Alan Jeffrey <ajeffrey@bell-labs.com>
Date: Mon, 21 May 2012 10:02:46 -0500
Message-ID: <4FBA5916.7060000@bell-labs.com>
To: Ivan Herman <ivan@w3.org>
CC: "Jeffrey, Alan S A (Alan)" <alan.jeffrey@alcatel-lucent.com>, Oskar Welzl <lists@welzl.info>, "public-rdfa@w3.org" <public-rdfa@w3.org>
Thanks! I'm glad this just turned out to be a bug, and that our RDFa 
works again.

A.

On 05/19/2012 10:03 AM, Ivan Herman wrote:
> Alan,
>
> the reason is simple: I had a bug:-)
>
> Actually, the interesting is not the HTML5 mode. I presume what Oskar did was to say something like:
>
> <html>
> <body>
> <foo xmlns:ex="http://example.com/ns#" resource="http://example.com/foo">
>      <link rel="ex:bar" href="http://example.com/baz"/>
> </foo>
> </body>
> </html>
>
> Or, if he did not do it by hand, the HTML5 parser does it when generating the DOM!
>
> Whereas the xml mode, ie, what you tried, was something like:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <foo xmlns:ex="http://example.com/ns#" resource="http://example.com/foo">
>      <link rel="ex:bar" href="http://example.com/baz"/>
> </foo>
>
>
> ie, the element was the top element of the XML file, ie, the generated DOM. Well... that is where I had a bug: I indeed insert an artificial @about to the top of the tree (unless there is an @about there) to set the default subject to the base URI, but I should not do this in the situation you have there. This type of error practically never occurred in HTML, because authors rarely touch the HTML element but, well, Murphy's law...
>
> I have updated the file. I do not know whether you use the code pulled from github or whether you use the distiller directly, but it should work now.
>
> Thanks!
>
> ivan
>
>
> On Apr 23, 2012, at 16:40 , Alan Jeffrey wrote:
>
>> On 04/22/2012 03:46 PM, Oskar Welzl wrote:
>>>> but the 1.1 distiller generates different output (the @about value
>>>> has changed):
>>>
>>> two distillers, three tries, two results:
>>
>> Ah, that's interesting, I hadn't tried it in HTML5 mode. How odd.
>>
>>>> Digging through the 1.1 spec (Sec 7.5, processing rule 5) it looks like
>>>> the distiller is doing the right thing: the @resource attribute only
>>>> sets the current object resource when there's an @rel, @rev or @property
>>>> attribute.
>>>
>>> This is just for my own understanding, my last post here shows I have
>>> problems understanding this myself, but: The way I read it, the
>>> @resource in your example *does* set a new subject:
>>
>> Yes, it sets a "new subject" (7.5, 5, alt 2) but not a "current object resource". In the case where there is a @property (7.5, 5, alt 1) or @rel (7.5, 6) the "current object resource" gets set to the @resource.
>>
>>> According to 7.5, 6.:
>>> <link rel="ex:bar" href="http://example.com/baz"/>
>>> contains @rel (that's why we're in 6.) but nothing that would match a
>>> "set new subject"-rule; so we keep "http://example.com/foo" from the
>>> parent as the subject. The object resource is taken from @href according
>>> to this processing rule.
>>> (Grant's table: [Current object resource] in "rel | rev mode")
>>
>> Ah, you may be right, I didn't read (7.5, 13) correctly. When recursively processing nodes "the parent object is set to value of current object resource, if non-null, or the value of new subject, if non-null, or ..." In this case, the "current object resource" is null, so the parent object should be set to the "new subject", which in this case is<http://example.com/foo>, not<>.
>>
>> So perhaps this is a bug with the distiller rather than a change in the spec? (This would make me happy, as it would mean no change to our RDFa!)
>>
>>> Cheers,
>>> Oskar
>>
>> A.
>>
>
>
> ----
> Ivan Herman, W3C Semantic Web Activity Lead
> Home: http://www.w3.org/People/Ivan/
> mobile: +31-641044153
> FOAF: http://www.ivan-herman.net/foaf.rdf
>
>
>
>
>
Received on Monday, 21 May 2012 15:04:00 GMT

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