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Revision as of 16:27, 17 December 2012 by Tantek (talk | contribs) (note details of hReview and hReview aggregate support)
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<entry-title>Google Search</entry-title>

Google is one of several search engines that index and support microformats.

main search supports rel="nofollow", hCard 1.0, hReview 0.4 (in progress), hReview aggregate, hProduct (since 2009-05-12 for rich snippets), hCalendar 1.0 (since 2010-01-22), and hRecipe 0.22 (since 2010-04-13) - in main search. See also related blog post on hCalendar hRecipe support.

rich snippets

Main article: Rich Snippets

Rich Snippets is Google Search's term for the enhancement of search results ("snippets") with information from microformats from pages.


Google's documentation on Rich snippets - Reviews support describes details:

  • the main topic of the page needs to be about a specific product or service. For example, using review markup on a page containing multiple products is not supported.
  • If the markup contains a single review, the reviewer’s name needs to be a valid name (Person or Organization)

hReview 0.4 (in progress) properties supported (bold = required)

  • item
    • fn
  • rating
    • value
    • best
      • value-title support:
         <span class="best"><span class="value-title" title="10"/></span>
    • worst
    • "Tip: Don't add a separate hidden text block to specify the rating. Hidden content will not be displayed."[1]
    • img alt number parsing:
      <img class="rating" src="four_star_rating.gif" alt="4 Star Rating: Recommended" />
    • value-title support:
      <span class="rating"><span class="value-title" title="4.5" /></span>
  • reviewer
  • dtreviewed
  • description
  • summary

hReview-aggregate 0.2 additional properties supported in addition to the above (or additional requirements / subproperties)

  • count - "The total number of reviews for the item on your site. Note: Whenever you include count, the page must also contain review markup for each reviewed item. count should only include reviews on your own site."
  • votes - "contributes toward the average rating but not towards the number of reviews available" - essentially, a "number of ratings" property.
  • rating - required in their hReview-aggregate support
  • rating
    • average (additional subproperty)
  • photo - though presumably this works in hReviews as well

advanced search

Through additional user interfaces:

search APIs

Google provides search APIs like:

see also