W3C home > Mailing lists > Public > public-lod@w3.org > February 2010

Re: Linking HTML pages and data

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Tue, 16 Feb 2010 15:35:31 -0500
Message-ID: <4B7B0193.7070601@openlinksw.com>
To: Ed Summers <ehs@pobox.com>
CC: public-lod@w3.org
Ed Summers wrote:
> Hi Sean,
> On Tue, Feb 16, 2010 at 7:39 AM, Sean Bechhofer
> <sean.bechhofer@manchester.ac.uk> wrote:
>> A simple (possibly dumb) question. Is there a standard mechanism for linking
>> an HTML page to the non-information resource that it describes?
> Not a dumb question at all--at least for me :-)
> I've been using the <link> pattern that Chris Bizer, Richard Cyganiak
> and Tom Heath documented in How To Publish Linked Data On The Web [1]
> for discovery of RDF documents that are related to a given HTML
> document.
> But you are asking about the relation between a document and the the
> *thing* being described. I agree with Damien that foaf:primaryTopic
> seems like it could work, and that one possibility would be to slip a
> bit of RDFa into the HTML document that asserted:
>   <> foaf:primaryTopic <http://dbpedia.org/resource/Mogwai_(band)> .
I agree with Damien too, I've nagged enough people about their RDF docs 
lacking the relation above :-)

Ironically, we left the relation out of the RDF docs we generate for 
DBpedia due to some legacy re-write rules :-(
> I also agree w/ Kingsley that it would be neat to also have a <link>
> pattern that non-RDFa folks could use:
>   <link rel="http://xmlns.com/foaf/0.1/primaryTopic"
> href="http://dbpedia.org/resource/Mogwai_(band)" title="Mogwai" />
> Or if mnot's Web Linking RFC is approved it would open the door to
> using the Link HTTP Header:
>   Link: <http://dbpedia.org/resource/Mogwai_(band)>;
> rel="http://xmlns.com/foaf/0.1/primaryTopic"; title="Mogwai"
We assumed this is a go, and already showcase it via URIBurner and 
DBpedia data space URIs.
> Registering [3] primaryTopic as a link relation type would tighten it
> up a bit, as well as help advertise the pattern.
>   <link rel="primaryTopic"
> href="http://dbpedia.org/resource/Mogwai_(band)" title="Mogwai" />
Yes, but right now rel="foaf:pimarytopic" is fine as a custom relation.

Conversely, "describedby" or "wrt:describedby" is emerging as a cool 
mechanism for connecting an Entity (via its generic HTTP URI) to the 
Resource that holds its description.
> At any rate, I'd be interested to hear if other people have other
> approaches to this. It would be nice to have a little recipe (w3c
> note?) people could follow when making these sorts of assertions on
> the web. Assuming one isn't there already of course :-)

We need to make a definitive note about Linked Data auto-discovery 
patterns, its way overdue.

> //Ed
> PS. the oai-ore folks had a similar use case to link descriptions to
> the thing being described. They ended up creating a new term
> oai:describes [4], and documented ways of layering assertions into rdf
> [5], atom [6] and html [7] documents. I think the vocabulary is
> probably too specific to aggregations and resource maps to be useful
> in the general case you are talking about though.
> PSS. I really just wanted to type Mogwai a bunch of times :-)
> [1] http://www4.wiwiss.fu-berlin.de/bizer/pub/LinkedDataTutorial/#discovery
> [2] http://tools.ietf.org/html/draft-nottingham-http-link-header-07
> [3] http://tools.ietf.org/html/draft-nottingham-http-link-header-07#section-6.2
> [4] http://www.openarchives.org/ore/1.0/vocabulary#ore-describes
> [5] http://www.openarchives.org/ore/1.0/rdfxml#remtoaggr
> [6] http://www.openarchives.org/ore/1.0/atom#metadata
> [7] http://www.openarchives.org/ore/1.0/discovery#HTMLLinkElement



Kingsley Idehen	      
President & CEO 
OpenLink Software     
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen 
Received on Tuesday, 16 February 2010 20:36:01 UTC

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