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Re: Syntax for itemprop breadcrumb

From: Gregg Kellogg <gregg@kellogg-assoc.com>
Date: Sat, 17 Dec 2011 12:00:53 -0500
To: John Panzer <jpanzer@google.com>
CC: Jeni Tennison <jeni@jenitennison.com>, public-vocabs <public-vocabs@w3.org>, Tim van Oostrom <tim@depulz.nl>, Aaron Bradley <aaranged@yahoo.com>
Message-ID: <FE0B82EA-D7DE-4AAD-BA3E-A9C638F4A5DF@kellogg-assoc.com>
Interesting that this is one place where RDFa @rel does what you want. It also requires @inlist to maintain the breadcrumb order.

RDFa Lite will have the same restrictions as microdata, requiring a @property on each <a> and depend on the vocabulary-specific handling of schema:breadcrumb to maintain order in RDF.

Gregg Kellogg
Sent from my iPhone

On Dec 17, 2011, at 7:43 AM, "John Panzer" <jpanzer@google.com<mailto:jpanzer@google.com>> wrote:


For my parser, (c) appears to be the answer today.

On Dec 17, 2011 12:30 AM, "Jeni Tennison" <jeni@jenitennison.com<mailto:jeni@jenitennison.com>> wrote:
Hi,

Just to point out that in something like:

<div itemprop="breadcrumb">
 <a href="category/books.html">Books</a> >
 <a href="category/books-literature.html">Literature & Fiction</a> >
 <a href="category/books-classics">Classics</a>
</div>

the 'breadcrumb' property actually takes the value "Books > Literature & Fiction > Classics" (whitespace normalised for brevity). So whether or not they have <a> elements wrapped around individual words doesn't matter: a conformant microdata processor won't see them anyway.

I've raised this before, but it is still not clear to me whether

a. schema.org<http://schema.org> consumers only want that plain text string;
b. schema.org<http://schema.org> consumers are preserving the HTML content (contrary to the microdata spec); or
c. the examples are wrong and the itemprop should be on individual breadcrumb items

Cheers,

Jeni

On 16 Dec 2011, at 23:30, Aaron Bradley wrote:

>
>
> Thanks for weighing in, Tom.
>
> In this case, though, all the examples explicitly show all breadcrumb links belonging to one itemprop - what they omit is an additional, unlinked "breadcrumb" component.
>
> See on http://schema.org/WebPage:

>
> <div itemprop="breadcrumb">
>   <a href="category/books.html">Books</a> >
>   <a href="category/books-literature.html">Literature & Fiction</a> >
>   <a href="category/books-classics">Classics</a>
> </div>
>
>
> By the way, the separate page identifier in the <h1> I wouldn't have a problem handling (it's not a breadcrumb) - it's the additional component on the same line.  E.g. (and this is the syntax I'm leaning towards - *not* including the unlinked item in the breadcrumb declaration):
>
>
> <div>
>
> <span itemprop="breadcrumb">
>   <a href="category/books.html">Books</a> >
>   <a href="category/books-literature.html">Literature & Fiction</a> >
>   <a href="category/books-classics">Classics</a></span> >
>   Boring Classics
> </div>
> <h1>Boring Classics</h1>
>
>
> ----- Original Message -----
>> From: Tim van Oostrom <tim@depulz.nl<mailto:tim@depulz.nl>>
>> To: public-vocabs@w3.org<mailto:public-vocabs@w3.org>
>> Cc:
>> Sent: Friday, December 16, 2011 2:26:37 PM
>> Subject: Re: Syntax for itemprop breadcrumb
>>
>> Hi Aaron,
>> I personally interpreted breadcrumb like:
>>
>> <div itemscope itemtype="http://schema.org/Thing";>
>>    <a href="category/books.html"
>> itemprop="breadcrumb">Books</a>  >
>>    <a href="category/books-literature.html"
>> itemprop="breadcrumb">Literature&  Fiction</a>  >
>>    <a href="category/books-classics"
>> itemprop="breadcrumb">Classics</a>  >
>>    Boring Classics
>> <h1 itemprop="name">Boring Classics</h1>
>>   </div>
>>
>>
>> 1 breadcrumb per Item/Link (semantically more obvious and less work to
>> determine what is what?)
>>
>> You'd have a list of breadcrumb(s). This should however be an ordered list.
>>
>> - Tim
>>
>>>   In breadcrumb display, the unlinked current page or section is often
>> displayed in the same line as the linked parents.  E.g.:
>>>
>>>   <div><a href="/">Home</a>  | About
>> us</div>
>>>
>>>   Should this unlinked portion be ("About us" in the example above)
>> be included in the breadcrumb itemprop or excluded from it? 1 or 2 below?
>>>
>>>
>>>   1 - Unlinked portion part of breadcrumb itemprop
>>>
>>>   <div itemprop="breadcrumb">
>>>     <a href="category/books.html">Books</a>  >
>>>     <a
>> href="category/books-literature.html">Literature&
>> Fiction</a>  >
>>>     <a href="category/books-classics">Classics</a>
>>>
>>>     Boring Classics
>>>   </div>
>>>
>>>   2 - Unlinked portion not a part of breadcrumb itemprop
>>>
>>>   <div>
>>>   <span itemprop="breadcrumb">
>>>     <a href="category/books.html">Books</a>  >
>>>     <a
>> href="category/books-literature.html">Literature&
>> Fiction</a>  >
>>>     <a
>> href="category/books-classics">Classics</a></span>
>>>
>>>     Boring Classics
>>>   </div>
>>>
>>>   None of the schema.org<http://schema.org> examples show this use case.
>>>
>>>   See also this same question on a G+ post - feel free to comment there.
>>>   https://plus.google.com/106943062990152739506/posts/Bf5ZYWkVtM1

>>>
>>>   Thanks,
>>>   Aaron
>>>
>>>
>>>
>>
>
>

--
Jeni Tennison
http://www.jenitennison.com



Received on Saturday, 17 December 2011 17:02:04 GMT

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