解决方法
The itemscope attribute us used to indicate that the element it is
placed on and it’s children represent a microdata item. The itemscope
should be paired with an itemtype attribute that defines the microdata
vocabulary in use.
<p itemscope itemtype="http://www.data-vocabulary.org/Organization/">…Additional data …
Microdata vocabularies can be nested and can
be dependent on one another. For example,the organization microdata
vocabulary also contains an address as a member. The itemtype url can
point to anything. Think of it as just a unique character string that
varIoUs programs have agreed that when they see that specific ID,they
know how to parse and look for the itemprop tags in the sub-elements
to extract the meaning needed from the document.
有预定义的项类型值,或者您可以创建自己的值.它们可能是URL,但不一定是URL.
以下是关于这个主题的其他参考资料(Google搜索“html5 microdata”还有更多的内容)：
http://net.tutsplus.com/tutorials/html-css-techniques/html5-microdata-welcome-to-the-machine/
