Appellation, vintage, ABV — verified.

Google Merchant CenterXML feed

<item>
  <g:gtin>3760099012015</g:gtin>
  <title>Château Margaux 2015 Premier Cru Classé, Margaux AOC, 750 ml</title>
  <g:google_product_category>499676</g:google_product_category>
  <g:product_highlight>Margaux AOC · Premier Cru Classé 1855</g:product_highlight>
  <g:product_highlight>Vintage 2015 · 13.5% vol · 750 ml</g:product_highlight>
  <g:product_highlight>95% Cab. Sauvignon · 4% Merlot</g:product_highlight>
  <g:product_highlight>Contains sulphites · serve 17 °C</g:product_highlight>
  <!-- Central adds structured product_detail blocks -->
  <g:product_detail>
    <g:section_name>Origin</g:section_name>
    <g:attribute_name>Appellation</g:attribute_name>
    <g:attribute_value>Margaux AOC</g:attribute_value>
  </g:product_detail>
  <g:product_detail>
    <g:section_name>Origin</g:section_name>
    <g:attribute_name>Vintage</g:attribute_name>
    <g:attribute_value>2015</g:attribute_value>
  </g:product_detail>
  <g:product_detail>
    <g:section_name>Composition</g:section_name>
    <g:attribute_name>ABV</g:attribute_name>
    <g:attribute_value>13.5% vol</g:attribute_value>
  </g:product_detail>
  <g:product_detail>
    <g:section_name>Composition</g:section_name>
    <g:attribute_name>Volume</g:attribute_name>
    <g:attribute_value>750 ml</g:attribute_value>
  </g:product_detail>
  <g:product_detail>
    <g:section_name>Composition</g:section_name>
    <g:attribute_name>Grape blend</g:attribute_name>
    <g:attribute_value>95% Cab. Sauv, 4% Merlot</g:attribute_value>
  </g:product_detail>
  <g:product_detail>
    <g:section_name>Allergens</g:section_name>
    <g:attribute_name>Allergen declaration</g:attribute_name>
    <g:attribute_value>Contains sulphites</g:attribute_value>
  </g:product_detail>
</item>

ChatGPT ShoppingJSON-LD payload

{
  "name": "Château Margaux 2015",
  "gtin": "3760099012015",
  "key_specs": {
    "appellation": "Margaux AOC",
    "vintage": 2015,
    "abv_pct": 13.5,
    "volume_ml": 750,
    "blend": "95% Cab. Sauv, 4% Merlot",
    "classification": "Premier Cru Classé"
  },
  "confidence": 0.96,
  "sources_count": 16
}