W3C home > Mailing lists > Public > public-rdf-in-xhtml-tf@w3.org > May 2006

Re: RDFa and GRDDL and Drupal

From: Ian Davis <iand@internetalchemy.org>
Date: Tue, 30 May 2006 11:30:25 +0100
Message-ID: <447C1EC1.1070209@internetalchemy.org>
To: Ben Adida <ben@mit.edu>
CC: Dan Connolly <connolly@w3.org>, public-rdf-in-xhtml task force <public-rdf-in-xhtml-tf@w3.org>

On 30/05/2006 02:37, Ben Adida wrote:

> Remember the RDFa requirements (a subset here, for clarity):
> 1) publisher independence in picking vocabularies
> 2) in-context metadata with copy-and-paste
> 3) expressing metadata about embedded objects and fragments of pages
> GRDDL doesn't provide (2). Microformats don't provide (1) and (3). eRDF 
> doesn't provide (2) and (3).

I'd just like to point out that eRDF can express metadata about embedded 
objects and fragments, so this fragment:

<div id="ian"><span class="foaf-name">Ian Davis</span></div>

embeds the following triple:

<#ian> foaf:name "Ian Davis" .

I'm also curious about what you regard as copy-and-paste metadata and 
why eRDF doesn't support it. I'm assuming you mean that you need the 
schema abbreviations for the embedded RDF to make sense? I don't see how 
RDFa solves this problem. I can copy the following XHTML fragment from 
an RDFa document and lose all context:

     <p role="cal:Vevent">
         I'm giving
         <meta property="cal:summary">
             a talk at the XTech Conference about web widgets
         <meta property="cal:dtstart" content="20060508T1000-0500">
             May 8th at 10am

Since the cal namespace prefix isn't used for elements or attributes how 
is the user agent supposed to know to copy the cal namespace declaration?

Blogging at... http://iandavis.com/blog
Working on... http://directory.talis.com/ui/
Received on Tuesday, 30 May 2006 10:30:33 UTC

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