Re: [http-range14] how to publish RDF for Information Resources

I see your point now. Thx, Andrea.

I just realise that there may be two scenarios:

1) RDF and HTML are just the representation of the same resource

Assume we have a weather report http://example.com/weatherreport which has
two representation in HTML (human readable representation) and RDF (machine
readable representation)

In this case, the content of HTML and RDF should be consistent.

We can use then using content negotiation to serve these two
representations for the same URI.

2) RDF describes a HTML Web Page Resource

For example

I have a resource about my homepage http://example.com/homepage.html
I have a metadata RDF about someone created this homepage
http://example.com/data/rdf

In this case, these two URIs are not referring to the same thing.

According to David Booth and Leo Sauermann, we should use <link> tag in
HTMl or not widely known HTTP link header (not accepted proposal).

I hope these are all cases. Please correct me if I am wrong.

Yang





On Fri, Feb 17, 2012 at 5:18 PM, Andrea Splendiani (RRes-Roth) <
andrea.splendiani@rothamsted.ac.uk> wrote:

>  Wait...
>
>  http://www.test.com/test.html <- this is a resource, and has it's own
> URI (1)
>  http://www.test.com/test.rdf <- this is another resource, and has it's
> own (distinct) URI (2)
>
>  Now, what I am saying is that in the RDF you can also predicate on the
> the URI (1).
> So if you ask information about (1), requiring a result in rdf, it seems
> reasonable to return (2) with predicates (eventually) on (1).
> This is not really incorrect, though it may be unpractical for some.
>
>  But perhaps I don't get your distinction between page and metadata.
>
>  Metadata on the page can also be in the html representation itself.
> In RDF I'm asking for a machine readable representation of the content of
> the page, rather than it's metadata only.
>
>  Do you mean something else by metadata ?
>
>  ciao,
> Andrea
>
>
>
>  Il giorno 17/feb/2012, alle ore 17.03, Yang Squared ha scritto:
>
> Hi Andrea,
>
>  I think using content negotiation is incorrect, the homepage is a
> resource need a URI, and the metadata RDF is another resource need another
> URI. Otherwise, we are saying the homepage and the metadata of the homepage
> is the same thing.
>
>  The representation of the homepage is the HTML page
> the representation of the metadata of the homepage is the RDF
>
>  Regards,
> Yang
>
>
> On Fri, Feb 17, 2012 at 4:24 PM, Andrea Splendiani (RRes-Roth) <
> andrea.splendiani@rothamsted.ac.uk> wrote:
>
>> Hi,
>>
>>  I'm using content negotiation.
>> In most of the cases, the "information resource" is actually something in
>> a database or stored somewhere. So representing it in html or rdf via
>> content negotiation seems plausible.
>>
>>  In case the information resource in html is what you want to predicate
>> (like, you have a collection of html files that you are serving) the rdf
>> returned via content negotiation could include predicates about the html
>> file uri.
>> If you are asking for the html file resource, this is always in html by
>> definition. Requesting an rdf implies anyway requesting something else.
>>
>>  ciao,
>> Andrea
>>
>>
>>  Il giorno 17/feb/2012, alle ore 02.21, Yang Squared ha scritto:
>>
>>  Hi all,
>>
>>  I have a Web architecture question here.
>>
>>  Assume I have a information resource URI
>> http://example.com/homepage.html
>>
>>  I would like to publish a RDF metadata (
>> http://example.com/data/homepagerdf) about this information resource
>> (e.g. homepage isCreatedBy steve). What publishing mechanism can I use?
>>
>>  since http://example.com/homepage.html is an Information Resource, when
>> dereferencing it, we should get that homepage.html document returned. How
>> can we possible redirect to a RDF?
>>
>>  Content negotiation can use to serve two different representation of
>> the resource, but both representation is for the same resource. So we
>> cannot use it.
>>
>> 303 can redirect one information resources to another information
>> resource, e.g. http://example.com/homepage.html --303-->
>> http://example.com/data/homepagerdf --200-->RDF
>>
>>  but in this way, when I dereferencing the original
>> http://example.com/homepage.html it did not result as a homepage.html
>> itself and got a RDF. So there is a paradox here.
>>
>>  Can anyone please suggest anything? Or the conclusion is that the RDFa
>> (or by using the link element to RDF) is the only way to publish RDF
>> metadata for information resources?
>>
>>  I am writing a paper and I would like to conclude that there will be no
>> case that a hashURI publishing mechanism and 303 redirection can be used
>> for Information Resource to publish RDF metadata. Do you have any object
>> case?
>>
>>  ------------------------------
>> One may recommend me to use RDFa. However, I consider that the RDFa is
>> not ideal solution to publish Linked Data at all.
>> First of all, embedding metadata together with data prohibits the
>> independent curation of data and metadata. Secondly, following the
>> principles of the Web Architecture, any distinct resource of significance
>> should be given a distinct URI, but in this approach a single URI is used
>> to identify two information resources. In general, the RDFa embedded
>> metadata approach can be replaced by using the <link> element href in XHTML
>> to pointing to an external RDF document, where the rel=”meta” attribute
>> can be used to indicate a relationship between resources.
>>
>>  Thanks a lot,
>> Yang Yang
>>
>> -----------------------------------
>>
>> Web and Internet Science
>>
>> Room 3027 EEE Building
>>
>> Electronics and Computer Science
>>
>> University of Southampton, SO17 1BJ
>>
>>
>>  Tel: +44(0)23 8059 8346
>>
>> twitter: @yang_squared <http://twitter.com/#!/yang_squared>
>>
>>
>>
>>
>>  --
>>
>> -----------------------------------
>>
>> Web and Internet Science
>>
>> Room 3027 EEE Building
>>
>> Electronics and Computer Science
>>
>> University of Southampton, SO17 1BJ
>>
>>
>>  Tel: +44(0)23 8059 8346
>>
>> twitter: @yang_squared <http://twitter.com/#!/yang_squared>
>>
>>
>>
>
>
>  --
>
> -----------------------------------
>
> Web and Internet Science
>
> Room 3027 EEE Building
>
> Electronics and Computer Science
>
> University of Southampton, SO17 1BJ
>
>
>  Tel: +44(0)23 8059 8346
>
> twitter: @yang_squared <http://twitter.com/#!/yang_squared>
>
>
>


-- 

-----------------------------------

Web and Internet Science

Room 3027 EEE Building

Electronics and Computer Science

University of Southampton, SO17 1BJ


Tel: +44(0)23 8059 8346

twitter: @yang_squared <http://twitter.com/#!/yang_squared>