W3C home > Mailing lists > Public > public-vocabs@w3.org > June 2014

Re: ItemList

From: Jarno van Driel <jarnovandriel@gmail.com>
Date: Wed, 11 Jun 2014 02:45:39 +0200
Message-ID: <CADK2AU3rDGAZD8VKQnPK2VrJ6Q3344scKMEyuKVSaA+SbkJG6A@mail.gmail.com>
To: Dan Brickley <danbri@google.com>
Cc: Markus Lanthaler <markus.lanthaler@gmx.net>, W3C Web Schemas Task Force <public-vocabs@w3.org>
And should the ItemLIst be linked to the WebPage by means of @breadcrumb?
eg. <ul itemprop="breadcrumb" itemscope itemtype="http://schema.org/ItemList
">


2014-06-11 1:09 GMT+02:00 Jarno van Driel <jarnovandriel@gmail.com>:

> Using @position made me aware that programmers actually aren't going to be
> fond of it starting to count at 1. Might I suggest this starts at 0 (as it
> makes the life of programmers easier).
>
>
> 2014-06-11 1:05 GMT+02:00 Jarno van Driel <jarnovandriel@gmail.com>:
>
> And now without markup errors. [sigh, sorry]
>>
>> <ul itemscope itemtype="http://schema.org/ItemList">
>>     <li itemprop="itemListElement" itemscope itemtype="
>> http://schema.org/ListItem">
>>         <span itemprop="item" itemscope itemtype="
>> http://schema.org/BreadCrumb">
>>             <a itemprop="url" href="http://schema.org/" title>
>>                  <span itemprop="name">Home</span>
>>             </a>
>>             <meta itemprop="position" content="1" />
>>         </span>
>>     </li>
>>     <li itemprop="itemListElement" itemscope itemtype="
>> http://schema.org/ListItem">
>>         <span itemprop="item" itemscope itemtype="
>> http://schema.org/BreadCrumb">
>>             <a itemprop="url" href="http://schema.org/Thing" title>
>>                 <span itemprop="name">Thing</span>
>>             </a>
>>             <meta itemprop="position" content="2" />
>>         </span>
>>     </li>
>>     <li itemprop="itemListElement" itemscope itemtype="
>> http://schema.org/ListItem">
>>         <span itemprop="item" itemscope itemtype="
>> http://schema.org/BreadCrumb">
>>             <a itemprop="url" href="http://schema.org/Intangible" title>
>>                 <span itemprop="name">Intangible</span>
>>             </a>
>>             <meta itemprop="position" content="3" />
>>         </span>
>>     </li>
>>     <li itemprop="itemListElement" itemscope itemtype="
>> http://schema.org/ListItem">
>>         <span itemprop="item" itemscope itemtype="
>> http://schema.org/BreadCrumb">
>>             <a itemprop="url" href="http://schema.org/StructuredValue"
>> title>
>>                 <span itemprop="name">StructuredValue</span>
>>             </a>
>>             <meta itemprop="position" content="4" />
>>         </span>
>>     </li>
>>     <li itemprop="itemListElement" itemscope itemtype="
>> http://schema.org/ListItem">
>>         <span itemprop="item" itemscope itemtype="
>> http://schema.org/BreadCrumb">
>>             <a itemprop="url" href="http://schema.org/ListItem" title>
>>                 <span itemprop="name">ListItem</span>
>>             </a>
>>             <meta itemprop="position" content="5" />
>>         </span>
>>     </li>
>> </ul>
>>
>>
>> 2014-06-11 1:03 GMT+02:00 Jarno van Driel <jarnovandriel@gmail.com>:
>>
>> Something like this for the breadcrumb perhaps?
>>>
>>> <ul>
>>>     <li itemprop="itemListElement" itemscope itemtype="
>>> http://schema.org/ListItem">
>>>         <span itemprop="item" itemscope itemtype="
>>> http://schema.org/BreadCrumb">
>>>             <a itemprop="url" href="/" title>
>>>                 <span itemprop="name">Home</span>
>>>             </a>
>>>             <meta itemprop="position" content="1" />
>>>         </span>
>>>     </li>
>>>     <li itemprop="itemListElement" itemscope itemtype="
>>> http://schema.org/ListItem">
>>>         <span itemprop="item" itemscope itemtype="
>>> http://schema.org/BreadCrumb">
>>>             <a itemprop="url" href="/Thing" title>
>>>                 <span itemprop="name">Thing</span>
>>>             </a>
>>>             <meta itemprop="position" content="2" />
>>>         </span>
>>>     </li>
>>>     <li itemprop="itemListElement" itemscope itemtype="
>>> http://schema.org/ListItem">
>>>          <span itemprop="item" itemscope itemtype="
>>> http://schema.org/BreadCrumb">
>>>             <a itemprop="url" href="http://schema.org/Intangible" title>
>>>                 <span itemprop="name">Intangible</span>
>>>             </a>
>>>             <meta itemprop="position" content="3" />
>>>         </span>
>>>     </li>
>>>     <li itemprop="itemListElement" itemscope itemtype="
>>> http://schema.org/ListItem">
>>>         <span itemprop="item" itemscope itemtype="
>>> http://schema.org/BreadCrumb">
>>>             <a itemprop="url" href="http://schema.org/StructuredValue"
>>> title>
>>>                 <span itemprop="name">StructuredValue</span>
>>>             </a>
>>>             <meta itemprop="position" content="4" />
>>>         </span>
>>>     </li>
>>>     <li itemprop="itemListElement" itemscope itemtype="
>>> http://schema.org/ListItem">
>>>         <span itemprop="item" itemscope itemtype="
>>> http://schema.org/BreadCrumb">
>>>             <a itemprop="url" href="http://schema.org/ListItem" title>
>>>                 <span itemprop="name">ListItem</span>
>>>             </a>
>>>             <meta itemprop="position" content="5" />
>>>         </span>
>>>     </li>
>>> </ul>
>>>
>>>
>>> 2014-06-11 0:43 GMT+02:00 Dan Brickley <danbri@google.com>:
>>>
>>> On 10 June 2014 22:36, Markus Lanthaler <markus.lanthaler@gmx.net>
>>>> wrote:
>>>> > On Tuesday, June 10, 2014 7:36 PM, Dan Brickley wrote:
>>>> >> On 10 June 2014 18:01, Alexander Shubin <ajax@yandex-team.ru> wrote:
>>>> >> >> Does it fit the schema design I posted?
>>>> >> >
>>>> >> > Sure. That’s why I proposed them :) Actually it uses the fact that
>>>> ItemListElement is
>>>> >> Thing.
>>>> >> >
>>>> >> >> Re 'numberOfElements' maybe we can find an existing property to
>>>> >> >> extend?
>>>> >> >
>>>> >> > I couldn't find anything suitable.
>>>> >
>>>> > Very minor point but numberOfItems might be better given how the
>>>> other properties and the type itself is documented:
>>>> >
>>>> > A list of *items* of any sort...
>>>> > A single list item...
>>>> > ListItem
>>>> > ...
>>>>
>>>> Perhaps, but we also use the word element, i.e. itemListElement.
>>>>
>>>> >> Adding,
>>>> >>
>>>> >> +    <div typeof="rdf:Property" resource="
>>>> http://schema.org/numberOfElements">
>>>> >> +      <span class="h" property="rdfs:label">numberOfElements</span>
>>>> >> +      <span property="rdfs:comment">The number of elements in an
>>>> >> ItemList.</span>
>>>> >> +      <span>Domain: <a property="http://schema.org/domainIncludes"
>>>> >> href="http://schema.org/ItemList">ItemList</a></span>
>>>> >> +      <span>Range: <a property="http://schema.org/rangeIncludes"
>>>> >> href="http://schema.org/Number">Number</a></span>
>>>> >> +    </div>
>>>> >>
>>>> >> I've added one example so far, based on your first.
>>>> >>
>>>> >> -> http://sdo-wip1.appspot.com/ItemList is updated, as is git
>>>> >> (https://github.com/danbri/schemaorg/commits/sdo-itemlist)
>>>>
>>>> > Both JSON-LD examples are invalid:
>>>> > In the first example the value of itemListElement should be an object
>>>> and thus be wrapped in {} and not [].
>>>>
>>>> That's a very old example originally; it might be the JSON-LD
>>>> conversion was flawed, I'll check.
>>>>
>>>> > The second example has two itemListElement properties which is
>>>> invalid (strangely the same example is used at schema.org/ListItem!?).
>>>> Both values should be wrapped in an array and collapsed into a single
>>>> property.
>>>> > You could also use a JSON number to express the value of
>>>> numberOfElements, i.e., remove the quotes around 315.
>>>>
>>>> Thanks - I was grabbing time between meetings and only checked on
>>>> JSONLint! Lesson learned :)
>>>>
>>>> I've gone with this for now (I'll check what we do elsewhere for
>>>> numbers):
>>>>
>>>> {
>>>>   "@context": "http://schema.org",
>>>>   "@type": "ItemList",
>>>>   "url": "http://multivarki.ru?filters%5Bprice%5D%5BLTE%5D=39600",
>>>>   "numberOfElements": "315",
>>>>   "itemListElement": [{
>>>>       "@type": "Product",
>>>>       "image": "
>>>> http://img01.multivarki.ru.ru/c9/f1/a5fe6642-18d0-47ad-b038-6fca20f1c923.jpeg
>>>> ",
>>>>       "url": "http://multivarki.ru/brand_502/",
>>>>       "name": "Brand 502"
>>>>     },{
>>>>       "@type": "Product",
>>>>       "name": "..."
>>>>     }
>>>>   ],
>>>>     "offers": {
>>>>       "@type": "Offer",
>>>>       "price": "4399 p."
>>>>     }
>>>> }
>>>>
>>>> Posted as http://sdo-wip1.appspot.com/ItemList
>>>>
>>>> > It would also be nice if an example using next and previous would be
>>>> added as people will probably struggle referencing it both from the
>>>> ItemList and from a ListItem at the same time if there isn't an example
>>>> they can copy-paste.
>>>>
>>>> Yes, more example suggestions welcomed.
>>>>
>>>> It's also an open question currently whether this design is adequate
>>>> to address Breadcrumb use cases (essentially an order list of url /
>>>> label pairs).
>>>>
>>>> Dan
>>>>
>>>>
>>>
>>>
>>> --
>>> *Jarno van Driel*
>>> Technical & Semantic SEO Consultant
>>> 8 Digits - Digital Marketing Technologies
>>>
>>> Tel: +31 652 847 608
>>> Google+: https://plus.google.com/u/0/+JarnovanDriel
>>> Linkedin: linkedin.com/pub/jarno-van-driel/75/470/36a/
>>>
>>
>>
>>
>> --
>> *Jarno van Driel*
>> Technical & Semantic SEO Consultant
>> 8 Digits - Digital Marketing Technologies
>>
>> Tel: +31 652 847 608
>> Google+: https://plus.google.com/u/0/+JarnovanDriel
>> Linkedin: linkedin.com/pub/jarno-van-driel/75/470/36a/
>>
>
>
>
> --
> *Jarno van Driel*
> Technical & Semantic SEO Consultant
> 8 Digits - Digital Marketing Technologies
>
> Tel: +31 652 847 608
> Google+: https://plus.google.com/u/0/+JarnovanDriel
> Linkedin: linkedin.com/pub/jarno-van-driel/75/470/36a/
>



-- 
*Jarno van Driel*
Technical & Semantic SEO Consultant
8 Digits - Digital Marketing Technologies

Tel: +31 652 847 608
Google+: https://plus.google.com/u/0/+JarnovanDriel
Linkedin: linkedin.com/pub/jarno-van-driel/75/470/36a/
Received on Wednesday, 11 June 2014 00:46:07 UTC

This archive was generated by hypermail 2.3.1 : Tuesday, 6 January 2015 21:29:42 UTC