title: Open Graph protocol code for Blogger and get the Post's Body
body: <p>I'm inserting on my blogger blog the code, such that it can create automatically  <a href="http://ogp.me/" rel="nofollow noreferrer">the Open Graph protocol</a> snippets used, for example, by many social media websites.</p>
  
  <p>I see many source code around, but none seems to work perfectly.</p>
  
  <p>I wrote this, which I inserted right before tag <code>&lt;/head&gt;</code> in the blogger template. It's working nice except on the property <code>og:description</code>. I'd like also to have the post content as description.</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;!-- OpenGraph starts--&gt;
  &lt;meta content='article' property='og:type'/&gt;
  &lt;meta expr:content='data:blog.title' property='og:site_name'/&gt;
  
  &lt;!-- Title and URL --&gt;
  &lt;meta expr:content='data:blog.pageName' property='og:title'/&gt;
  &lt;meta expr:content='data:blog.canonicalUrl.https' property='og:url'/&gt;
  
  &lt;!--Description--&gt;
  &lt;b:if cond='data:blog.metaDescription'&gt;
      &lt;meta expr:content='data:blog.metaDescription' property='og:description'/&gt;
  &lt;b:elseif cond='data:post.snippet'/&gt;
      &lt;meta expr:content='data:post.snippet' property='og:description'/&gt;
  &lt;b:else/&gt;
      &lt;meta expr:content='data:I_WANT_THE_POST_BODY' property='og:description'/&gt;
  &lt;/b:if&gt;
  
  &lt;!-- Image --&gt;
  &lt;b:if cond='data:blog.postImageThumbnailUrl'&gt;
      &lt;meta expr:content='data:blog.postImageThumbnailUrl' property='og:image'/&gt;
  &lt;b:elseif cond='data:blog.postImageUrl'/&gt;
      &lt;meta expr:content='data:blog.postImageUrl' property='og:image'/&gt;    
  &lt;b:else/&gt;
      &lt;meta content='MY_BLOG_LOGO_URL' property='og:image'/&gt; 
  &lt;/b:if&gt;
  
  &lt;meta expr:content='data:blog.locale' property='og:locale'/&gt;
  
  &lt;!-- OpenGraph ends--&gt;
  </code></pre>
  
  <p>My problem is that I can't really get the post Body, and as stated in <a href="https://support.google.com/blogger/answer/47270?hl=en" rel="nofollow noreferrer">documentation</a>, that is <code>posts.body</code>.</p>
  
  <p><strong>Which is the <code>data</code> variable to get the body/content of the current/viewed/available post?</strong></p>