My code:

<main vocab="http://schema.org"> 
<article  typeof="NewsArticle">

<h2 property="headline">Wie instaliert Virtual Box in Windows 10</h2>

 <link property="image" href="http://htmlkurss.xyz/Bilder/Virtualbox.png" />

  <meta property="name" content="Virtual Box" />
  <meta property="mainEntityOfPage" content="http://google.de" />
  <meta property="datePublished" content="2019-03-07" />
  <meta property="dateModified" content="2019-03-17" />
  <span property="publisher" typeof="Organization">
    <link property="name" href="http://htmlkurss.xyz" />
     <span property="logo" typeof="ImageObject">
      <link property="contentUrl url" href="http://htmlkurss.xyz/Bilder/Virtualbox.png"  title="VirtualBox"/>

  <div property="text">Virtual Box ist eine Virtualisierungssoftware, die viele Betriebessysteme emulieren kann. Sie funktioniert mit Linux , Mac und Windows. Sie hat auch veschiedenene Sprachen für ihre Oberfläche, wie beispielsweise Deutsch, Englisch ,... 

 <span property="author" typeof="Person" >
  <meta property="name" content="http://htmlkurss.xyz" />


Google Structured Data Testing Tool says that all is good, except this piece:

<span property="publisher" typeof="Organization">
    <link property="name" href="http://htmlkurss.xyz" />

For name, it says:

Not selected Type

but when I use meta, it doesn’t give this warning:

 <span property="publisher" typeof="Organization">
    <meta property="name" content="http://htmlkurss.xyz" />

But I read the best solution when giving an URL is to use <link> and href="".

What can I do to prevent the "Unspecified Type" warning?


First of all, "Unspecified Type" is not a warning. The SDTT simply states that no type is specified.

Why does it do this?

Because you are providing a URL value for a property which expects a Text value:

Values expected to be one of these types

It doesn’t make much sense to say that the name is represented/identified by a URL. If your Organization really has the name "http://htmlkurss.xyz" (instead of "HTML Kurss", for example), then you should still use the meta element, because it’s not a URL, it’s a string that looks like a URL.

<meta property="name" content="http://htmlkurss.xyz" />

For the actual URL of the Organization, you would use:

<link property="url" href="http://htmlkurss.xyz" />
  • Very Thanks for your explanation , i understand it ! , i will write "<meta property="name" content="htmlkurss.xyz" />" – biotza Mar 26 '19 at 17:21

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