the product. Use with the URL of a ProductModel or a textual representation of the model identifier. The URL of the ProductModel can be from an external source. It is recommended to additionally provide strong product identifiers via the gtin8/gtin13/gtin14 and mpn properties.</td>
        </tr>

        <tr><th class="prop-nam" scope="row">
          <code>mpn</code></th>
          <td class="prop-ect">



                Text


          </td>
          <td class="prop-desc">The Manufacturer Part Number (