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additionalType

Thing > Property > additionalType

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.
Values expected to be one of these types
URL
Used on these types
Thing
Super-properties
rdf:type
Examples

Example 1
<!-- 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>
 <!-- Uses both the "Book" and "Product" item types to support Offer relationships -->
 <div itemscope itemtype="http://schema.org/Book" itemid="#record">
   <link itemprop="additionalType" href="http://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="http://schema.org/Offer">
         <th>Copy </th>
         <td>Available
           <link itemprop="availability" href="http://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="http://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>
 <!-- Uses both the "Book" and "Product" item types to support Offer relationships -->
<div vocab="http://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="http://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>
<script type="application/ld+json">
{
  "@context":  "http://schema.org/",
  "@id": "#record",
  "@type": "Book",
  "additionalType": "Product",
  "name": "Le concerto",
  "author": "Ferchault, Guy",
  "offers":{
      "@type": "Offer",
      "availability": "http://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>