- From: Ivan Herman <ivan@w3.org>
- Date: Fri, 11 Nov 2011 10:07:51 +0100
- To: Jeni Tennison <jeni@jenitennison.com>
- Cc: RDFa WG <public-rdfa-wg@w3.org>
On Nov 11, 2011, at 24:11 , Jeni Tennison wrote: > Hi, > > I noticed in the minutes of your meeting today that you talked a bit about symmetry between @rel and @property. > > I did a write-up showing parallel microformats, microdata and RDFa markup recently [1] and without even trying (I didn't pick this case specifically, just selected an example from schema.org randomly) came up against the unwanted chaining issue that Michael Steidl raised last month [2]. The example was to create > > [ a schema:Event ; > schema:url <nba-miami-philidelphia-game3.html> ; > schema:name " Miami Heat at Philadelphia 76ers - Game 3 (Home Game 1) " ; ] > > with markup like: > > <div about="_:event" vocab="http://schema.org/" typeof="Event"> > <a rel="url" href="nba-miami-philidelphia-game3.html"> > <span about="_:event"> > NBA Eastern Conference First Round Playoff Tickets: > <span property="name"> Miami Heat at Philadelphia 76ers - Game 3 (Home Game 1) </span> > </span> > </a> > ... > </div> > > Note the use of the blank node named _:event in order to bypass the unwanted chaining; I couldn't think of another way of doing it without repeating content (does anyone else have another suggestion?). > > So I'm really pleased to see the adoption of @property *without* chaining, which allows this to be rewritten as: > > <div vocab="http://schema.org/" typeof="Event"> > <a property="url" href="nba-miami-philidelphia-game3.html"> > NBA Eastern Conference First Round Playoff Tickets: > <span property="name"> Miami Heat at Philadelphia 76ers - Game 3 (Home Game 1) </span> > </a> > ... > </div> > > This is a plea to not to make @property always chain: not chaining is useful, and it is a good thing to give a publisher an easy way to do it. Thank you! This issue was discussed yesterday, and we decided _not_ to provide a symmetry with exactly this type of usage in mind... > > I also support not changing @rel behaviour, both for backwards-compatibility reasons and because although it's useful to have non-chaining behaviour, it is *also* useful sometimes to have chaining. I don't think the lack of symmetry is a problem if you think of @rel as an advanced variant of normal @property behaviour rather than them being synonyms. > I agree Thanks Ivan > Cheers, > > Jeni > > [1] http://www.w3.org/wiki/Mixing_HTML_Data_Formats#Mixing_Syntaxes > [2] http://lists.w3.org/Archives/Public/public-rdfa-wg/2011Oct/0018.html > -- > Jeni Tennison > http://www.jenitennison.com > > ---- Ivan Herman, W3C Semantic Web Activity Lead Home: http://www.w3.org/People/Ivan/ mobile: +31-641044153 FOAF: http://www.ivan-herman.net/foaf.rdf
Received on Friday, 11 November 2011 09:05:24 UTC