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Re: Indicating main entity / primaryTopic - proposal to use 'schema.org/about'

From: Jarno van Driel <jarnovandriel@gmail.com>
Date: Tue, 20 May 2014 19:19:50 +0200
Message-ID: <CADK2AU0vUj5DfcSv5Optm8Lo5k7+HWwOf9Y41RESVm-KRU_8AA@mail.gmail.com>
To: Dan Brickley <danbri@google.com>
Cc: Jason Douglas <jasondouglas@google.com>, W3C Web Schemas Task Force <public-vocabs@w3.org>
OK, that markup surprises me (probable has more to do with me).

I always imagined writing something like:

<body itemscope itemtype="http://schema.org/ItemPage">
    <link itemprop="about" href="https://www.freebase.com/m/0crgbp8">

    <div itemprop="mainContentOfPage" itemscope itemtype="
http://schema.org/Product">
        [...]
    </div>
</body>


2014-05-20 19:01 GMT+02:00 Dan Brickley <danbri@google.com>:

> On 20 May 2014 17:30, Jason Douglas <jasondouglas@google.com> wrote:
> > I think you buried the lede in the github link at the bottom.  :)
> ( https://gist.github.com/anonymous/cf7e24f6378b176aa010 )
>
> Ok, let's jump into the markup. It does flush out some issues -
>
>
> > In terms of markup would it be reasonable to do this?
>
> Slight tweaks (discussing hashes and slashes with Dan Scott and
> Stephane Corlosquet in IRC...):
>
>  <html vocab="http://schema.org/">
>    <head>
>      <link property="about" href="#main_item"/>
>    </head>
>    <body>
>      <div resource="#main_item" typeof="MusicEvent">
>        ...
>      </div>
>    </body>
>  </html>
>
> (this adds a '/' in the @vocab url, and # within @resource attribute)
>
> > and rely on an implicit WebPage subject?
>
> Looks fine from RDFa point of view. Even though "implicit WebPage" is
> a schema.org convention, generic RDFa 1.1 parsing would attach the
> 'about' property to the default base URL, which would be the page.
>
> As for Microdata I'm not sure the best pattern, but this with more
> RDFa-ish structure in the <head> might be bearable:
>
> <html>
>    <head>
>      <link rel="http://schema.org/about" href="#main_item"/>
>    </head>
>    <body>
>      <div id="main_item" itemscope itemtype="http://schema.org/MusicEvent
> ">
>        ...
>      </div>
>    </body>
>  </html>
>
>
> FWIW another everything in the body pattern that works for RDFa (but
> dips into RDFa 1.1 beyond the Lite subset) is:
>
> <div vocab="http://schema.org/" typeof="Person">
>  <link rev="about" href=""/>
>  <span property="name">John Smith</span>
> </div>
>
> Which brings me to another issue that's never far away - we have a lot
> of ways of saying quite similar but different things(*):
>
> <div vocab="http://schema.org/" typeof="Person">
>  <link rel="url sameAs officialWebPage" rev="about" href=""/>
>  <span property="name">John Smith</span>
> </div>
>
> At least this is pretty compact markup, but we owe the world an
> account of how at least 'url', 'sameAs' and 'about' interact.
>
> e.g. for any x, y where  x--sameAs-->y, is y--about-->x going to be true?
>
> sameAs's definition: "URL of a reference Web page that unambiguously
> indicates the item's identity. E.g. the URL of the item's Wikipedia
> page, Freebase page, or official website." ... which covers the
> official website use case.
>
>
> Dan
>
>
>
> (*) officialWebPage is used by Yandex e.g. see
> http://help.yandex.com/webmaster/supported-schemas/review-car.xml but
> similar ideas surfaced here in the social/profile/account discussion
>
>
Received on Tuesday, 20 May 2014 17:20:23 UTC

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