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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>,
         on
         <meta property="cal:dtstart" content="20060508T1000-0500">
             May 8th at 10am
         </meta>.
     </p>

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?


Ian
-- 
http://purl.org/NET/iand
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Received on Tuesday, 30 May 2006 10:30:33 GMT

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