W3C home > Mailing lists > Public > public-rdf-in-xhtml-tf@w3.org > December 2008

Re: It is a feature:-( Re: Markup questions: html/body, datatype="", double predicates

From: Richard Cyganiak <richard@cyganiak.de>
Date: Wed, 10 Dec 2008 17:42:12 +0000
Cc: public-rdfa@w3.org, W3C RDFa task force <public-rdf-in-xhtml-tf@w3.org>
Message-Id: <E1E53CF0-407D-4A5E-9736-A65E77F3A7F6@cyganiak.de>
To: Ivan Herman <ivan@w3.org>

Ivan,

On 10 Dec 2008, at 13:39, Ivan Herman wrote:
>> <html rel="foaf:maker" rev="foaf:homepage">
>>  <body about="#me">
>>    ...
>>
>> I expect this to generate these triples:
>>
>> <> foaf:maker <#me> .
>> <#me> foaf:homepage <> .
>>
>> But what I get from the RDFa Distiller:
>>
>> <> foaf:maker <#me> .
>> <#me> foaf:homepage <> .
>> <> foaf:maker <> .
>> <> foaf:homepage <> .
>>
>> Why is this?
>
> This is not a bug, it is an (ugly!) feature!:-(

Hm, weird.

So I presume the lesson is that RDFa authors should keep their hands  
off the <html> element or weird things might happen.

I found a way of saying what I wanted in a simple way:

<body rel="foaf:primaryTopic foaf:maker" rev="foaf:homepage"  
resource="#me">

It has the same effect and seems just a little bit less natural to me.

Richard



> And this is related to
> what I quoted in my previous mail:
>
> [[[
> Actually, there might be a slight issue in the spec, though: the spec
> explicitly says "if the element is the head or body element then act  
> as
> if there is an empty @about present" but it does not say anything  
> about
> the html element...
> ]]]
>
> so, the extra <>-s you get are because the <head> does not include any
> @about and therefore an implicit @about="" is added! If you put an
> @about in the head, too,
>
> <html rel="foaf:maker" rev="foaf:homepage">
>   <head about="#you">
>   <body about="#me">
>
> then you get
>
> <rdfa-test.html#me> foaf:homepage <rdfa-test.html> .
> <rdfa-test.html#you> foaf:homepage <rdfa-test.html> .
> <rdfa-test.html> foaf:maker <rdfa-test.html#me>, <rdfa- 
> test.html#you> .
>
> I am not saying it is nice but, well, that is the way it seems to  
> be:-(
>
> Ivan
>
> -- 
>
> Ivan Herman, W3C Semantic Web Activity Lead
> Home: http://www.w3.org/People/Ivan/
> PGP Key: http://www.ivan-herman.net/pgpkey.html
> FOAF: http://www.ivan-herman.net/foaf.rdf
Received on Wednesday, 10 December 2008 17:44:30 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 17:01:59 UTC