- From: Ian Davis <iand@internetalchemy.org>
- Date: Wed, 14 Jun 2006 19:38:23 +0100
- To: Misha Wolf <Misha.Wolf@reuters.com>
- CC: public-rdf-in-xhtml-tf@w3.org, www-tag@w3.org, newsml-2@yahoogroups.com
On 14/06/2006 13:48, Misha Wolf wrote: > Hi Ian, > > Good point. NewsML 2 has also taken your approach #2. What syntax > is eRDF using for this? eRDF uses a convention that I first saw described in a W3C workshop report from 1996 [1]. This was later adopted for the Dublin Core[2]. Basically a schema prefix is declared in the head of the document like this: <link rel="schema.dc" href="http://purl.org/dc/elements/1.1/" /> That sets up the 'dc' prefix to map to the specified URI In eRDF you can refer to that prefix in class attributes like this: <div class="dc-title"> or <div class="dc.title"> Both of which denote the http://purl.org/dc/elements/1.1/title property URI The particular choice of delimiter (hyphen or dot) was arbitrary. The historical documents mentioned above use dots but when I wanted to extend it to work in the body of the document I added the option of a hyphen since dots have a particular meaning in the XHTML binding of CSS. I did consider making it configurable, e.g. allowing <meta name="erdf.delimiter" content=":" /> But decided against the added complexity. Not that it would be hard to implement but it's another convention for humans to learn. Anyone looking for an intro to eRDF might be interested in the presentation I gave at XTech this year: http://research.talis.com/2005/erdf/xtech2006.html Ian [1] http://www.w3.org/Search/9605-Indexing-Workshop/ReportOutcomes/S6Group2.html [2] http://www.dublincore.org/documents/dcq-html/ -- http://purl.org/NET/iand Blogging at... http://iandavis.com/blog Working on... http://directory.talis.com/
Received on Wednesday, 14 June 2006 18:38:57 UTC