Validates in STDD, but is sharedContent ignored?

    <div itemscope='itemscope' itemtype='http://schema.org/BlogPosting'>
      <div itemprop='articleBody'>
        <div itemprop='sharedContent'>
          <div itemscope itemtype="http://schema.org/ImageObject"/>
            <a href="1.png" itemprop="url"><img itemprop="image" src="1.png" /></a>
          </div>
        </div>
        <div itemprop='sharedContent'>
          <div itemscope itemtype="http://schema.org/ImageObject"/>
            <a href="2.png" itemprop="url"><img itemprop="image" src="2.png" /></a>
          </div>
        </div>
        <div itemprop='sharedContent'>
          <div itemscope itemtype="http://schema.org/ImageObject"/>
            <a href="3.png" itemprop="url"><img itemprop="image" src="3.png" /></a>
          </div>
        </div>
      </div>
    </div>