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

From: Mark Birbeck <mark.birbeck@webbackplane.com>
Date: Wed, 10 Dec 2008 13:00:52 -0500
Message-ID: <ed77aa9f0812101000q45bca47bv79d7513bade7c114@mail.gmail.com>
To: "Richard Cyganiak" <richard@cyganiak.de>
Cc: public-rdfa@w3.org, "W3C RDFa task force" <public-rdf-in-xhtml-tf@w3.org>
Hi Richard,

It's all a matter of taste, but I think this part lends itself quite nicely
to appearing in a link element in the head:

  rel="foaf:primaryTopic foaf:maker"

This approach is used in the RDFa/FOAF description here:

  <
http://internet-apps.blogspot.com/2008/02/first-steps-in-rdfa-creating-foaf.html
>

Regards,

Mark

On Wed, Dec 10, 2008 at 12:42 PM, Richard Cyganiak <richard@cyganiak.de>wrote:

>
> 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
>>
>
>


-- 
Mark Birbeck, webBackplane

mark.birbeck@webBackplane.com

http://webBackplane.com/mark-birbeck

webBackplane is a trading name of Backplane Ltd. (company number
05972288, registered office: 2nd Floor, 69/85 Tabernacle Street,
London, EC2A 4RR)
Received on Wednesday, 10 December 2008 18:01:30 GMT

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