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Re: Mixing-up Semantic Data with HTML Rendering

From: landong zuo <landong.zuo@googlemail.com>
Date: Mon, 5 Dec 2011 15:38:35 +0000
Message-ID: <CACNn1briZN58YYrYU20dxGcTVkzmTfmBQ5UiiW+zPyDXjAF6ZQ@mail.gmail.com>
To: Mark Birbeck <mark.birbeck@webbackplane.com>
Cc: Toby Inkster <tai@g5n.co.uk>, public-rdfa-wg@w3.org
Hi Mark,

I totally agree with you regarding the graph container using
"@typeOf=rdf:Graph" and separation between"<head>" and "<body>".
This would give me the perfect solution to distinguish metadata
triples from document.

I am wondering if it is appropriate to have this feature included in
the future release of RDFa processing model as "the recommended

I don't know how many RDFa parsers support Named Graph yet. I am sure
not every consumer or developer would love to write his/her specific



On Mon, Dec 5, 2011 at 2:26 PM, Mark Birbeck
<mark.birbeck@webbackplane.com> wrote:
> Hi Landong,
> On Mon, Dec 5, 2011 at 10:40 AM, landong zuo
> <landong.zuo@googlemail.com> wrote:> Hi Toby,>> The working-around
> style sheet you pointed out should work well in> this particular case.
> Many thanks for your suggestion.>> My use case falls into the class as
> you states "converting to RDFa and> injecting to HTML template". We
> have to be very careful in this> process not to confuse "HTML
> semantics" with "RDF semantics". This is> really painful.>> The case
> could become even worse to have attached metadata like RDF> signature
> or Provenance. This type of metadata could be generated by> different
> organisations, and has to be carried all the way through> data
> transformation process without change to the semantics. We have> no
> control over RDF triples.  Additional triples like xhv:stylesheet>
> would definitely ruin the metadata.>> I think Named Graph will be a
> promising answer for this type of> questions. What do you think?
> IMO any web-page that is parsed for RDF is a named graph, whether it
> wants to be or not. :) When implementing an RDFa parser I always used
> to store the triples from any HTML page into a named graph identified
> by the document's URI, as if the following were present [1]:
>  <html>
>    <head about="" typeof="rdf:Graph">
>      <!-- everything in here is about the named graph -->
>    </head>
>    .
>    .
>    .
>  </html>
> The fact that a named graph also has a CSS stylesheet is therefore no
> big deal (and anyway, it's true).
> If authors then follow best practice and refrain from mixing their
> people up with their web-pages, then all other triples should come out
> fine:
>  <html>
>    <head about="" typeof="rdf:Graph">
>      <!-- everything in here is about the named graph -->
>    </head>
>    <body about="#langdong" typeof="foaf:Person">
>      <!-- everything in here is about the object represented by the
> named graph -->
>    </body>
>  </html>
> As you can see, I don't think anything needs to change in RDFa to make
> your scenario possible.
> Regards,
> Mark
> [1] I'm pretty sure that Jeremy Carroll proposed rdf:Graph some time
> back, but I can't find a reference. I'm sure someone like Ivan will
> know where it comes from though. ;)
Received on Monday, 5 December 2011 15:39:12 UTC

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