结构化数据(微数据)和嵌入式项目 [英] Structured data (microdata) and embedded items
问题描述
我想在Schema.org中使用Microdata来定义网页的主要内容，所以我做了这样的事情:
I want to use Microdata with Schema.org to define the main content of my webpage, so I did something like this:
<body itemscope="itemscope" itemtype="http://schema.org/WebPage">
...
<div itemprop="mainContentOfPage" itemscope="itemscope" itemtype="http://schema.org/WebPageElement">
<div itemprop="breadcrumb" itemscope="itemscope" itemtype="http://schema.org/BreadcrumbList">...</div>
</div>
...
</body>
问题是，当我在Google结构化数据测试工具下检查架构时，收到错误消息:
The problem is that when I check the schema under the Google Structured Data Testing Tool I receive the error:
对于类型为WebPageElement的对象，Google无法识别属性面包屑".
The property breadcrumb is not recognised by Google for an object of type WebPageElement.
那么怎么说breadcrumb与WebPage的itemscope相关而不是与WebPageElement的itemscope相关?由于设计原因，我无法从WebPageElement div中获得breadcrumb.
So how to say that the breadcrumb is related to the itemscope of the WebPage and not to the itemscope of the WebPageElement? Because of the design, I can not get the breadcrumb out of the WebPageElement div.
顺便说一句，在这里我以breadcrumb为例，它可以是任何其他属性，例如copyrightHolder或headline.
By the ways, I use breadcrumb just as an example here—it can be any other property, like copyrightHolder or headline, for example.
推荐答案
有一个丑陋的解决方案:添加一个具有itemscope(但没有itemtype)作为breadcrumbs属性父级的div，并使用itemref将breadcrumb属性添加到WebPage项目.
There is an ugly solutions for this: add a div with an itemscope (but without itemtype) as parent for the breadcrumbs property, and use itemref to add the breadcrumb property to the WebPage item.
<body itemscope="itemscope" itemtype="http://schema.org/WebPage" itemref="breadcrumbs">
<div itemprop="mainContentOfPage" itemscope="itemscope" itemtype="http://schema.org/WebPageElement">
<div itemscope>
<div itemprop="breadcrumb" itemscope="itemscope" itemtype="http://schema.org/BreadcrumbList" id="breadcrumbs">…</div>
</div>
</div>
</body>
我不建议这样做(但这是有效的微数据).您确实应该尝试更改标记结构，这样就不必像这样嵌套它了.
I don’t recommend this (but it’s valid Microdata). You should really try to change the markup structure so that you don’t have to nest it like that.
话虽如此，您可能想使用 mainEntity / mainContentOfPage ，因为mainContentOfPage仅用于WebPageElement个项目，因此它不是很有用.
Having said that, you might want to use mainEntity/mainEntityOfPage instead of mainContentOfPage, because mainContentOfPage is only for WebPageElement items, which makes it not very useful.
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