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{ "@context": "https://schema.org", "@type": "Product", "aggregateRating": { "@type": "AggregateRating", "ratingValue": "3.5", "reviewCount": "11" }, "description": "0.7 cubic feet countertop microwave. Has six preset cooking categories and convenience features like Add-A-Minute and Child Lock.", "name": "Kenmore White 17\" Microwave", "image": "kenmore-microwave-17in.jpg", "offers": { "@type": "Offer", "availability": "http://schema.org/InStock", "price": "55.00", "priceCurrency": "USD" }, "review": [ { "@type": "Review", "author": "Ellie", "datePublished": "2011-04-01", "description": "The lamp burned out and now I have to replace it.", "name": "Not a happy camper", "reviewRating": { "@type": "Rating", "bestRating": "5", "ratingValue": "1", "worstRating": "1" } }, { "@type": "Review", "author": "Lucas", "datePublished": "2011-03-25", "description": "Great microwave for the price. It is small and fits in my apartment.", "name": "Value purchase", "reviewRating": { "@type": "Rating", "bestRating": "5", "ratingValue": "4", "worstRating": "1" } } ] }

{
  "@context": "https://schema.org",
  "@type": "Product",
  "aggregateRating": {
    "@type": "AggregateRating",
    "ratingValue": "3.5",
    "reviewCount": "11"
  },
  "description": "0.7 cubic feet countertop microwave. Has six preset cooking categories and convenience features like Add-A-Minute and Child Lock.",
  "name": "Kenmore White 17\" Microwave",
  "image": "kenmore-microwave-17in.jpg",
  "offers": {
    "@type": "Offer",
    "availability": "http://schema.org/InStock",
    "price": "55.00",
    "priceCurrency": "USD"
  },
  "review": [
    {
      "@type": "Review",
      "author": "Ellie",
      "datePublished": "2011-04-01",
      "description": "The lamp burned out and now I have to replace it.",
      "name": "Not a happy camper",
      "reviewRating": {
        "@type": "Rating",
        "bestRating": "5",
        "ratingValue": "1",
        "worstRating": "1"
      }
    },
    {
      "@type": "Review",
      "author": "Lucas",
      "datePublished": "2011-03-25",
      "description": "Great microwave for the price. It is small and fits in my apartment.",
      "name": "Value purchase",
      "reviewRating": {
        "@type": "Rating",
        "bestRating": "5",
        "ratingValue": "4",
        "worstRating": "1"
      }
    }
  ]
}

{ "@context": "https://schema.org", "@type": "Product", "aggregateRating": { "@type": "AggregateRating", "bestRating": "100", "ratingCount": "24", "ratingValue": "87" }, "image": "dell-30in-lcd.jpg", "name": "Dell UltraSharp 30\" LCD Monitor", "offers": { "@type": "AggregateOffer", "highPrice": "$1495", "lowPrice": "$1250", "offerCount": "8", "offers": [ { "@type": "Offer", "url": "save-a-lot-monitors.com/dell-30.html" }, { "@type": "Offer", "url": "jondoe-gadgets.com/dell-30.html" } ] } }

{
  "@context": "https://schema.org",
  "@type": "Product",
  "aggregateRating": {
    "@type": "AggregateRating",
    "bestRating": "100",
    "ratingCount": "24",
    "ratingValue": "87"
  },
  "image": "dell-30in-lcd.jpg",
  "name": "Dell UltraSharp 30\" LCD Monitor",
  "offers": {
    "@type": "AggregateOffer",
    "highPrice": "$1495",
    "lowPrice": "$1250",
    "offerCount": "8",
    "offers": [
      {
        "@type": "Offer",
        "url": "save-a-lot-monitors.com/dell-30.html"
      },
      {
        "@type": "Offer",
        "url": "jondoe-gadgets.com/dell-30.html"
      }
    ]
  }
}

{ "@context": "https://schema.org", "@type": "Product", "aggregateRating": { "@type": "AggregateRating", "ratingValue": "3.5", "reviewCount": "11" }, "description": "0.7 cubic feet countertop microwave. Has six preset cooking categories and convenience features like Add-A-Minute and Child Lock.", "name": "Kenmore White 17\" Microwave", "image": "kenmore-microwave-17in.jpg", "offers": { "@type": "Offer", "availability": "http://schema.org/InStock", "price": "55.00", "priceCurrency": "USD" }, "review": [ { "@type": "Review", "author": "Ellie", "datePublished": "2011-04-01", "description": "The lamp burned out and now I have to replace it.", "name": "Not a happy camper", "reviewRating": { "@type": "Rating", "bestRating": "5", "ratingValue": "1", "worstRating": "1" } }, { "@type": "Review", "author": "Lucas", "datePublished": "2011-03-25", "description": "Great microwave for the price. It is small and fits in my apartment.", "name": "Value purchase", "reviewRating": { "@type": "Rating", "bestRating": "5", "ratingValue": "4", "worstRating": "1" } } ] }

{ "@context": "https://schema.org", "@type": "Product", "aggregateRating": { "@type": "AggregateRating", "bestRating": "100", "ratingCount": "24", "ratingValue": "87" }, "image": "dell-30in-lcd.jpg", "name": "Dell UltraSharp 30\" LCD Monitor", "offers": { "@type": "AggregateOffer", "highPrice": "$1495", "lowPrice": "$1250", "offerCount": "8", "offers": [ { "@type": "Offer", "url": "save-a-lot-monitors.com/dell-30.html" }, { "@type": "Offer", "url": "jondoe-gadgets.com/dell-30.html" } ] } }

{
  "@context": "https://schema.org",
  "@type": "Product",
  "aggregateRating": {
    "@type": "AggregateRating",
    "ratingValue": "3.5",
    "reviewCount": "11"
  },
  "description": "0.7 cubic feet countertop microwave. Has six preset cooking categories and convenience features like Add-A-Minute and Child Lock.",
  "name": "Kenmore White 17\" Microwave",
  "image": "kenmore-microwave-17in.jpg",
  "offers": {
    "@type": "Offer",
    "availability": "http://schema.org/InStock",
    "price": "55.00",
    "priceCurrency": "USD"
  },
  "review": [
    {
      "@type": "Review",
      "author": "Ellie",
      "datePublished": "2011-04-01",
      "description": "The lamp burned out and now I have to replace it.",
      "name": "Not a happy camper",
      "reviewRating": {
        "@type": "Rating",
        "bestRating": "5",
        "ratingValue": "1",
        "worstRating": "1"
      }
    },
    {
      "@type": "Review",
      "author": "Lucas",
      "datePublished": "2011-03-25",
      "description": "Great microwave for the price. It is small and fits in my apartment.",
      "name": "Value purchase",
      "reviewRating": {
        "@type": "Rating",
        "bestRating": "5",
        "ratingValue": "4",
        "worstRating": "1"
      }
    }
  ]
}
{
  "@context": "https://schema.org",
  "@type": "Product",
  "aggregateRating": {
    "@type": "AggregateRating",
    "bestRating": "100",
    "ratingCount": "24",
    "ratingValue": "87"
  },
  "image": "dell-30in-lcd.jpg",
  "name": "Dell UltraSharp 30\" LCD Monitor",
  "offers": {
    "@type": "AggregateOffer",
    "highPrice": "$1495",
    "lowPrice": "$1250",
    "offerCount": "8",
    "offers": [
      {
        "@type": "Offer",
        "url": "save-a-lot-monitors.com/dell-30.html"
      },
      {
        "@type": "Offer",
        "url": "jondoe-gadgets.com/dell-30.html"
      }
    ]
  }
}
1
source | link

According to the guide of Google to Revew:

Aggregate ratings: An aggregate evaluation of an item by many people should be marked up as a AggregateRating.

and then they inform us:

Refer clearly to a specific product or service. Do this by nesting the review or ratings within the markup of another schema.org type—such as schema.org/Book or schema.org/LocalBusiness —or by using that schema.org typed element as a value for the itemReviewed property.

Thus, on a particular web page of your website with one and a specific product, you can apply markup for reviews of this product that were made only on this web page but not on third-party websites.

Example:

{ "@context": "https://schema.org", "@type": "Product", "aggregateRating": { "@type": "AggregateRating", "ratingValue": "3.5", "reviewCount": "11" }, "description": "0.7 cubic feet countertop microwave. Has six preset cooking categories and convenience features like Add-A-Minute and Child Lock.", "name": "Kenmore White 17\" Microwave", "image": "kenmore-microwave-17in.jpg", "offers": { "@type": "Offer", "availability": "http://schema.org/InStock", "price": "55.00", "priceCurrency": "USD" }, "review": [ { "@type": "Review", "author": "Ellie", "datePublished": "2011-04-01", "description": "The lamp burned out and now I have to replace it.", "name": "Not a happy camper", "reviewRating": { "@type": "Rating", "bestRating": "5", "ratingValue": "1", "worstRating": "1" } }, { "@type": "Review", "author": "Lucas", "datePublished": "2011-03-25", "description": "Great microwave for the price. It is small and fits in my apartment.", "name": "Value purchase", "reviewRating": { "@type": "Rating", "bestRating": "5", "ratingValue": "4", "worstRating": "1" } } ] }

The guide of Google for Product informs us:

a shopping aggregator page that lists a single product, along with information about different sellers offering that product

Thus, to create markup for many sellers of the same product, use the type AggregateOffer.

Example:

{ "@context": "https://schema.org", "@type": "Product", "aggregateRating": { "@type": "AggregateRating", "bestRating": "100", "ratingCount": "24", "ratingValue": "87" }, "image": "dell-30in-lcd.jpg", "name": "Dell UltraSharp 30\" LCD Monitor", "offers": { "@type": "AggregateOffer", "highPrice": "$1495", "lowPrice": "$1250", "offerCount": "8", "offers": [ { "@type": "Offer", "url": "save-a-lot-monitors.com/dell-30.html" }, { "@type": "Offer", "url": "jondoe-gadgets.com/dell-30.html" } ] } }