eg-0416

<!-- Product: Value References -->
<div itemscope itemtype="https://schema.org/Product">
  <img itemprop="image" src="camera123.jpg" alt="" />
  <span itemprop="name">Digital Camera 123</span>
  <div itemprop="additionalProperty" itemscope itemtype="https://schema.org/PropertyValue">
      <span itemprop="name">Operating Voltage</span>
      <span itemprop="minValue">100</span>-
      <span itemprop="maxValue">250</span>
      <meta itemprop="unitCode" content="VLT">volts
      at
      <div itemprop="valueReference" itemscope itemtype="https://schema.org/PropertyValue">
         <span itemprop="value">50</span>
         <span itemprop="unitText">Hz</span>
      </div>
  </div>
</div>

<!-- Product: Value References -->
<div>
  <img src="camera123.jpg" alt="" />
  <span>Digital Camera 123</span>
  <div>
      <span>Operating Voltage</span>
      <span>100</span>-
      <span>250</span>
      volts
      at
      <div>
         <span>50</span>
         <span>Hz</span>
      </div>
  </div>
</div>