Answer by Matthias Pfefferle for Microdata: moving from microformats to schema.org (example hAtom news markup?)

You have to choose a page type, like for example http://schema.org/Blog and then add the article/blogposts http://schema.org/BlogPosting

Here is a very simple example:

<div itemscope itemtype="http://schema.org/Blog">  ...<article  itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">    ...</article><article  itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">    ...</article></div>

I have tried to implement it in a WordPress theme, perhaps my code will help you: https://github.com/pfefferle/SemPress/