- From: Mark Birbeck <mark.birbeck@webbackplane.com>
- Date: Mon, 14 Jul 2008 10:22:32 +0100
- To: "Tom Heath" <Tom.Heath@talis.com>
- Cc: "Kingsley Idehen" <kidehen@openlinksw.com>, public-lod@w3.org, semantic-web@w3.org
Hi Tom, > Question: is it worth creating a duplicate RDF graph by using RDFa in > HTML documents, when there is also RDF/XML available just one <link > rel=".../> away, and at a distinct URI? Doesn't this RDFa + RDF/XML > pattern complicate the RDF-consumption picture in general... It's difficult to answer this definitively. However, one factor to consider is that the technique you describe was *already* in existence when work began on RDFa, some four or five years ago. (And, for that matter, when work began on Microformats, too.) Given that there were few uses of this technique, outside of controlled environments, I don't think we can say that RDFa has made the situation _more_ complicated, or that it will inhibit adoption. And of course, I'm biased. :) I would say that RDFa has made the situation an order of magnitude _less_ complicated, since authors and developers now have an easier way to publish metadata; as Kinglsey said, increasing the number of ways to publish metadata increases the number of possible clients that might consume the data: >> I also forgot to mention obvous use of RDFa in the HTML doc >> which broadens the range of rdf aware user agents tha >> commence RDF discovery from HTML One more thing on your comments: > [snip] > > Does it not > also complicate the picture of making provenance statements using named > graphs, if the subject of the triple could be both an HTML document and > an RDF graph? Is it possible to distinguish a graph URI? I hadn't realised that. It would certainly be a good idea to have an rdf:Graph type, but I hadn't realised that there was one. However, is not an rdf:Graph a type of information resource? An RDF/XML document delivered from a web server is both a document and a graph, but we have chosen to ignore that in the RDF architecture; it's not possible to say 'this graph was published by', in RDF/XML, i.e., to talk about the information resource itself, because you will always be talking about whatever the RDF/XML itself is about. But there is no reason that we could not enable this, and if we wanted to go this route, RDFa+HTML allows it. Regards, Mark -- 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 Monday, 14 July 2008 09:23:07 UTC