W3C home > Mailing lists > Public > whatwg@whatwg.org > May 2011

[whatwg] Proposed simplification to Microdata

From: Guha <guha@google.com>
Date: Sun, 29 May 2011 12:20:43 -0700
Message-ID: <BANLkTin5H9L_=cwWx-Ka-QUP2OMdRGVq9g@mail.gmail.com>
Thank you.

Can you point me at the portion of the HTML 5 spec that allows link and meta
to be used
in the body?

thanks,

guha

On Thu, May 26, 2011 at 6:15 PM, Tab Atkins Jr. <jackalmage at gmail.com>wrote:

> On Thu, May 26, 2011 at 12:02 PM, Guha <guha at google.com> wrote:
> > We are trying to simplify statement of a fairly common thing that crops
> up
> > with microdata
> >
> > E.g.,
> >
> > Consider the block:
> > 1) <div itemscope itemtype=?http://schema.org/Book?>
> >      <span itemprop=?name?>The Catcher in the Rye</span> -
> >     by <span itemprop=?hasAuthor?>J.D. Salinger</span>
> >   </div>
> >
> > Now, the site wants to use the wikipedia (or freebase) entry for
> Salinger,
> > just to be clear and wants the value of the  hasAuthor property to be an
> > item with that ID.
> > I believe the following says that:
> >
> > 2) <div itemscope itemtype=?http://schema.org/Book?>
> >      <span itemprop=?name?>The Catcher in the Rye</span> -
> >   by <a href="http://en.wikipedia.org/wiki/J._D._Salinger"
> > itemprop=?hasAuthor?>J.D.
> > Salinger</a>
> >   </div>
> >
> > Often, the site does not want to link out to the wikipedia (or other
> > canonical url) page, but only specify
> > it in the microdata. This can be done by:
> >
> > 3) <div itemscope itemtype=?http://schema.org/Book?>
> >     <span itemprop=?name?>The Catcher in the Rye</span> -
> >   by <span itemscope
> > itemid="http://en.wikipedia.org/wiki/J._D._Salinger"
> > itemprop=?hasAuthor?>J.D.
> > Salinger</span>
> >  </div>
>
> No, that's invalid:
> "The itemid attribute must not be specified on elements that do not
> have both an itemscope attribute and an itemtype attribute specified,
> and must not be specified on elements with an itemscope attribute
> whose itemtype attribute specifies a vocabulary that does not support
> global identifiers for items, as defined by that vocabulary's
> specification."
>
> The correct way to solve this case is with markup like this:
>
> <div itemscope itemtype="http://scheme.org/Book">
>   <span itemprop="name">The Catcher in the Rye</span> -
>   by J.D. Salinger
>  <link itemprop="hasAuthor" href="
> http://en.wikipedia.org/wiki/J._D._Salinger">
> </div>
>
> <link> and <meta> are defined to be allowed in the <body> specifically
> to carry non-visible Microdata information.
>
> ~TJ
>
Received on Sunday, 29 May 2011 12:20:43 UTC

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