title: Google does not correctly merge microdata and json+ld in the same page using same URI id
body: <p>I have a product page with "microdata" and "json+ld" codes. Both of the codes refers to the same @id URI object (<a href="http://www.example.org/product#this" rel="nofollow">http://www.example.org/product#this</a>) so I would expect to "mix/merge" both properties, but instead structured data testing tool shows 2 "individual" products so....</p>
  
  <p>1- Does Google support using two syntax in the same page?<br>
  2- Is this well implemented? Can I refer two codes to the same object using itemId for microdata and @id for json+ld?<br>
  3- Can this damage my page in terms of structure data indexing?  </p>
  
  <p>thanks</p>
  
  <p>You can check it out using this code in <a href="https://developers.google.com/structured-data/testing-tool/" rel="nofollow">test tool</a>:</p>
  
  <pre><code>&lt;div itemscope itemtype="http://schema.org/Product" itemid="http://www.example.org/product#this"&gt;
      &lt;a itemprop="url" href="http://www.example.org/product"&gt;
      &lt;div itemprop="name"&gt;&lt;strong&gt;Product Name&lt;/strong&gt;&lt;/div&gt;&lt;/a&gt;
      &lt;div itemprop="description"&gt;Product Description&lt;/div&gt;
      &lt;div itemprop="brand" itemscope itemtype="http://schema.org/Organization"&gt;&lt;span itemprop="name"&gt;Product Brand&lt;/span&gt;&lt;/div&gt;
      &lt;div itemprop="offers" itemscope itemtype="http://schema.org/Offer"&gt;        &lt;span itemprop="price"&gt;100&lt;/span&gt;&lt;link itemprop="itemCondition" href="http://schema.org/NewCondition" /&gt; New&lt;/div&gt;
  &lt;/div&gt;
  &lt;script type="application/ld+json"&gt;
  {
    "@context": "http://schema.org/",
    "@id": "http://www.example.org/product#this",
    "name": "Product Name",
    "@type": "Product",
    "image": "http://www.example.com/anvil_executive.jpg",
    "mpn": "925872",
    "brand": {
      "@type": "Thing",
      "name": "ACME"
    },
    "offers": {
      "@type": "Offer",
      "priceCurrency": "USD",
      "price": "119.99",
      "itemCondition": "http://schema.org/UsedCondition",
      "availability": "http://schema.org/InStock"
    }
  }
  &lt;/script&gt;
  </code></pre>