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The HTML5 DOM and RDFa

Thu, 2009-09-24 08:05 — Jeni

One of the fundamental disconnects between HTML5 and previous versions of HTML is the way in which you answer the question “what is the structure of this page?”. Things that make use of that structure, such as RDFa, need to take this into account.

An example is the document:

<html>
  <head><title>HTML example</title></head>
  <body>
    <table>
      <span>Example title</span>
      <tr><td>Example table</td></tr>
    </table>
  </body>
</html>

On Resolvability

Fri, 2009-08-28 22:02 — Jeni

In my last post about RDFa and HTML I talked about how one of the gulfs that separates the HTML5 and Semantic Web communities is the attitude to the resolvability of property (and class) URIs.

I’m currently experimenting with introducing the ability to automatically locate information about properties and other resources that are referenced within triples to rdfQuery, so now is a good time, as far as I’m concerned, to look more closely at what the ability to resolve properties gives you and how to avoid problems if the property URI is (temporarily or permanently) unresolvable or resolvable to something new.

I’m going to attempt to answer:

  • How do or might applications use property and class URIs?
  • How can data and ontology publishers assist them in doing so?
  • What should frameworks (such as rdfQuery) do to help application developers?

HTML5/RDFa Arguments

Fri, 2009-08-21 18:28 — Jeni

When I came back from holiday, I caught up with the recent discussions around RDFa and HTML5. It’s exhausting reading so many posts repetitively reiterating the positions of people who all have the best of intentions but fundamentally different priorities. And such a shame that so much energy is spent on fruitless discussion when it could be spent at the very least improving specifications, if not testing, implementing, experimenting or otherwise in some very minor way changing the world.

What You Can't Do with HTML5 Microdata

Wed, 2009-05-13 00:57 — Jeni

Update: Fixed a couple of errors in the microdata code.

The HTML5 microdata proposal has hit the web, just days before Google announced its support for RDFa (or at least one vocabulary encoded using RDFa attributes). These are, indeed, “interesting times” for the semantic web.

Now, if you’re one of those weirdos who want to embed RDF triples within your web pages, what you’re going to care about is whether you can use microdata to do it. Those of us who have been using RDFa in anger, rather than in toy examples, know that it can be hard to map a particular set of RDF statements onto HTML content. I thought I’d take a look to see just what it would be like to create particular RDF with the HTML5 microdata proposal.

Evolving Standards

Sun, 2009-05-10 20:36 — Jeni

I’ve been trying to finalise this post for a long time now, but today’s publication of an HTML5 draft that includes a new microdata section makes it all the more relevant. The long and short of it is that I am less and less concerned about the huge mess that is the HTML5 standardisation process. On the one hand, it’s a huge mess; on the other, it doesn’t matter.

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