W3C home > Mailing lists > Public > public-rdfa@w3.org > March 2009

Re: embed RDFa --> embed coolness into Yahoo search results

From: Ian Hickson <ian@hixie.ch>
Date: Tue, 17 Mar 2009 18:39:43 +0000 (UTC)
To: Julian Reschke <julian.reschke@gmx.de>
Cc: Ben Adida <ben@adida.net>, RDFa <public-rdf-in-xhtml-tf@w3.org>, "public-rdfa@w3.org" <public-rdfa@w3.org>
Message-ID: <Pine.LNX.4.62.0903171831330.2690@hixie.dreamhostps.com>
On Tue, 17 Mar 2009, Julian Reschke wrote:
> > 
> > What's unfortunate however is that Yahoo seems to be confused about URIs and
> > CURIEs in @rel. As predicted. See: [...]
>
> I have to take this back. Apparently somebody constructed this example 
> to show the ambiguity that *may* occur because of the @rel syntax change 
> (yes .-); it has nothing to do with the Yahoo announcement.

Your original point still stands, though. Yahoo!'s implementation is 
incredibly buggy. For example it treats the prefix values as meaningful, 
it ignores the namespace of the elements on which the RDFa attributes are 
placed, it treats equivalent RDFa statements as different, etc.

Some tests that can be passed to Yahoo!'s testing page:

   http://hixie.ch/www/tests/adhoc/rdfa

(Note that the second test somehow breaks their system so much that the 
button for showing the RDF doesn't even appear.)

More worryingly, though, I have to say that in trying to write these tests 
I had an extremely confusing experience reading the RDFa specification. 
When can one use href="" and when can one use resource=""? Does using 
content="" with an absolute URL work also? What are the implications of 
using property="" instead of rel=""? When does nesting matter and when 
does it not matter? Does it matter whan URL the assertions are made about, 
or will the SearchMonkey tool simply grab all the assertions from the 
document regardless of what URL they are about? What parts are necessary 
and what parts are optional?

The more I try to learn and use RDFa, the more confused I get.

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Tuesday, 17 March 2009 18:40:22 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Tuesday, 17 March 2009 18:40:23 GMT