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additionalType

A Schema.org Property
An additional type for the item, typically used for adding more specific types from external vocabularies in microdata syntax. This is a relationship between something and a class that the thing is in. In RDFa syntax, it is better to use the native RDFa syntax - the 'typeof' attribute - for multiple types. Schema.org tools may have only weaker understanding of extra types, in particular those defined externally.

Subclass of:
Values expected to be one of these types
URL
Used on these types
Thing
Examples

Example 1
Copied
Example notes or example HTML without markup.
<!-- Uses both the "Book" and "Product" item types to support Offer relationships -->

 <div>
   <h3>Le concerto</h3>
   <div>
       Bibliographic Details
       <table>
         <tr>
           <th>Main Author: </th>
           <td>Ferchault, Guy</td>
         </tr>
       </table>
   </div>
 </div>

 <div>
     Holdings details from Anytown City Library
     <table>
       <!-- Example of a copy available for loan -->
       <tr>
         <th>Copy </th>
         <td>Available
           <div>Barcode: <span>CONC91000937</span></div>
           <div>Call number: <span>780 R2</span></div>
           <div>Library: <span>Anytown City Library</span></div>
         </td>
       </tr>
     <table>
 </div>
Example encoded as Microdata embedded in HTML.
 <!-- Uses both the "Book" and "Product" item types to support Offer relationships -->

 <div itemscope itemtype="https://schema.org/Book" itemid="#record">
   <link itemprop="additionalType" href="https://schema.org/Product"/>
   <h3 itemprop="name">Le concerto</h3>
   <div>
       Bibliographic Details
       <table>
         <tr>
           <th>Main Author: </th>
           <td itemprop="author">Ferchault, Guy</td>
         </tr>
       </table>
   </div>
 </div>

 <div>
     Holdings details from Anytown City Library
     <table>
       <!-- Example of a copy available for loan -->
       <tr itemscope itemtype="https://schema.org/Offer">
         <th>Copy </th>
         <td>Available
           <link itemprop="availability" href="https://schema.org/InStock">
           <div>Barcode: <span itemprop="serialNumber">CONC91000937</span></div>
           <div>Call number: <span itemprop="sku">780 R2</span></div>
           <div>Library: <span itemprop="offeredBy" itemscope itemtype="https://schema.org/Library" itemid="http://library.anytown.gov.uk" >Anytown City Library</span></div>
           <link itemprop="businessFunction" href="http://purl.org/goodrelations/v1#LeaseOut">
           <link itemprop="itemOffered" href="#record">
         </td>
       </tr>
     </table>
 </div>
Example encoded as RDFa embedded in HTML.
 <!-- Uses both the "Book" and "Product" item types to support Offer relationships -->
<div vocab="https://schema.org/" resource="#record" typeof="Book Product">
    <h3 property="name">
        Le concerto
    </h3>
    <div>
        Bibliographic Details
        <table>
            <tr>
                <th>
                    Main Author:
                </th>
                <td property="author">
                    Ferchault, Guy
                </td>
            </tr>
        </table>
    </div>
</div>
<div>
    Holdings details from Anytown City Library
    <table vocab="https://schema.org/">
        <!-- Example of a copy available for loan -->
        <tr typeof="Offer">
            <th>
                Copy
            </th>
            <td>
                Available
                <div>
                    Barcode: <span property="serialNumber">CONC91000937</span>
                </div>
                <div>
                    Call number: <span property="sku">780 R2</span>
                </div>
                <div>
                    Library: <span property="offeredBy" typeof="Library" resource="http://library.anytown.gov.uk">Anytown City Library</span>
                </div>
            </td>
        </tr>
    </table>
</div>
Example encoded as JSON-LD in a HTML script tag.
<script type="application/ld+json">
{
  "@context":  "https://schema.org/",
  "@id": "#record",
  "@type": "Book",
  "additionalType": "Product",
  "name": "Le concerto",
  "author": "Ferchault, Guy",
  "offers":{
      "@type": "Offer",
      "availability": "https://schema.org/InStock",
      "serialNumber": "CONC91000937",
      "sku": "780 R2",
      "offeredBy": {
          "@type": "Library",
          "@id": "http://library.anytown.gov.uk",
          "name": "Anytown City Library"
      },
      "businessFunction": "http://purl.org/goodrelations/v1#LeaseOut",
      "itemOffered": "#record"
    }
}
</script>
Structured representation of the JSON-LD example.