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I tested this RDFa on Google Structured Data Testing Tool:

<main vocab="http://schema.org"> 
<article typeof="NewsArticle">
  <h2 property="headline">Wie instaliert Virtual Box in Windows 10</h2>
  <span property="name" value="Virtual Box"/>
  <span property="mainEntityOfPage" value="http://google.de"/>
  <span property="datePublished" value="2019-03-07"/>
  <span property="dateModified" value="2019-03-17"/>
  <span property="publisher" typeof="Organization">

      <span property="logo" value="https://schema.org/"></span>
      <img src="http://htmlkurss.xyz/index.php/Bilder/Virtualbox.png" alt="Logo"/>

  </span>

  <p property="text">Virtual Box ist eine Virtualisierungssoftware, die viele Betriebessysteme ,... 
  </p>
  <p property="author" typeof="Person">Autor: <span property="name">ich</span></p>

  <p>Korrekturen: <span property="editor">me</span></p>
</article>

and the SDTT tells me that

logo.itemtype has an invalid value

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<span property="logo" value="https://schema.org/"></span>

This is invalid HTML, the span element can’t have a value attribute. And if it could have one, the logo property value would be https://schema.org/, but that’s of course not the logo. You probably meant this:

<link property="logo" href="/index.php/Bilder/Virtualbox.png" />

While this is valid Schema.org, Google expects an ImageObject value for the logo property, so you could use this:

<span property="logo" typeof="ImageObject">
  <img property="contentUrl url" src="/index.php/Bilder/Virtualbox.png" alt="VirtualBox"/>
</span>

(Note that "Logo" is not a suitable alt value in this context.)

  • Very Thanks ! , Mila ezker! auf meine Sprache – biotza Mar 14 at 18:54
  • With , property="contentUrl url" , google warnin me ,(Die Eigenschaft contentUrl wird von Google nicht als Objekt des Typs Organization erkannt.) – biotza Mar 14 at 19:02
  • @biotza: It seems that you added it at the wrong place then. You have to add the logo with typeof="ImageObject" (!) inside of Organization. – unor Mar 14 at 20:11

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