I'm building a news aggregator website. This is my current schema structure for a single news article. There can be more than one article per page. I'm trying to have every possible piece of data structured. Am I missing something? How can this structure be schema.org-optimized for a news article post?<article itemscope itemtype=http://schema.org/NewsArticle>    <meta itemprop=inLanguage content=es-419 />    <meta itemprop=dateModified content=2015-03-02T19:03Z />    <meta itemprop=keywords content=correa, obama, whitehouse />    <meta itemprop=commentCount content=41 />    <meta itemprop=description content=Excerpt of the news text goes here... />    <meta itemprop=isBasedOnUrl content=http://eluniverso.com/2015/03/01/noticia3.html />    <h2 itemprop=headline>        <a href=/noticias/2015/02/03/headline-goes-here itemprop=url>Headline goes here</a>    </h2>    <time datetime=2015-03-02T17:43Z itemprop=datePublished>Mar 2</time>    <p itemprop=articleBody>Complete article goes here. Two or three lines perhaps. Maybe more.</p>    <span class=tag itemprop=articleSection>politics</span>    <span class=length itemprop=wordCount>67</span>    <img src=uploads/image_4.jpg itemprop=thumbnailUrl>    <div itemprop=aggregateRating itemscope itemtype=http://schema.org/AggregateRating>        <meta itemprop=bestRating content=5>        <meta itemprop=worstRating content=1>        <span itemprop=ratingValue>4.1</span>/5 based on <span itemprop=reviewCount>249</span> votes    </div>    <span class=source itemprop=publisher itemscope itemtype=http://schema.org/Organization>        <meta itemprop=logo content=/logos/eluniverso.png />        <span itemprop=name>            <a href=http://eluniverso.com/2015/03/01/example1.html>El Universo</a>        </span>    </span></article><ul itemscope itemtype=http://schema.org/WebPage>    <li><a href=/noticias/2015/02/01/original-breaking-news.html itemprop=relatedLink>Related News 1</a></li>    <li><a href=/noticias/2015/02/02/more-data.html itemprop=relatedLink>Related News 2</a></li>    <li><a href=/noticias/2015/02/03/other-thing-that-happened.html itemprop=relatedLink>Related News 3</a></li></ul>
Schema.org structure for a news aggregator individual post
html5;microdata
HTML5+MicrodataIn case of meta/link: If the value is a URI, you have to use link instead of meta. So this<meta itemprop=isBasedOnUrl content=http://eluniverso.com/2015/03/01/noticia3.html />should be<link itemprop=isBasedOnUrl href=http://eluniverso.com/2015/03/01/noticia3.html />and this<meta itemprop=logo content=/logos/eluniverso.png />should be<link itemprop=logo href=/logos/eluniverso.png />Your thumbnail img is missing the required alt attribute.Schema.orgIn addition to (or instead of) headline it can be beneficial to provide name. The headline property can only be used for CreativeWork (and sub-types), while the name property is defined for every type. Its likely that many consumers look for and make use of name but not headline.You could provide both properties, separated with a space, on the same element, i.e.,<h2 itemprop=headline name>If the link in Organization is about this organization, you might want to use the url property.The WebPage could reference the NewsArticle via the mainEntity property (if the page is only about a single news article; otherwise the NewsArticle could reference its WebPage with the reverse mainEntityOfPage property).While you could use Microdatas itemref attribute to reference it without changing the markup structure, its not necessary if markup changes are possible. You could specify WebPage on a container div (or the body, if its the only/current web page), e.g.:<div itemscope itemtype=http://schema.org/WebPage>  <!-- properties about the web page, i.e., the web pages URL -->  <article itemprop=mainEntity itemscope itemtype=http://schema.org/NewsArticle>    <!-- properties about the news article, i.e., the news articles URL -->  </article>  <ul>    <li><a itemprop=relatedLink href=/noticias/2015/02/01/original-breaking-news.html>Related News 1</a></li>    <li><a itemprop=relatedLink href=/noticias/2015/02/02/more-data.html>Related News 2</a></li>    <li><a itemprop=relatedLink href=/noticias/2015/02/03/other-thing-that-happened.html>Related News 3</a></li>  </ul></div>