Create Schema "ISBN" for specific feature

[Pedro]

I want to related a featured to a a specific SCHEMA "isbn" but as everything appears in the code, I don't know how to do it.

 

ISBN: <span itemprop="isbn">9781627052191</span><br>

 

The code is:

<section class="product-features">
        <p class="h6">{l s='Specific References' d='Shop.Theme.Catalog'}</p>
          <dl class="data-sheet">
            {foreach from=$product.specific_references item=reference key=key}
              <dt class="name">{$key}</dt>
              <dd class="value">{$reference}</dd>
            {/foreach}
          </dl>

 

thanks