hReview-aggregate 0.2

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This document represents a draft microformat specification. Although drafts are somewhat mature in the development process, the stability of this document cannot be guaranteed, and implementers should be prepared to keep abreast of future developments and changes. Watch this wiki page, or follow discussions on the #microformats Freenode IRC channel to stay up-to-date.

hReview-aggregate is a format for embedding review information (of products, services, businesses, etc). Whereas hReview is intended for an individual review, hReview-aggregate is meant for summary information about a collection of user or critic reviews about an item. hReview-aggregate is one of several microformats open standards suitable for embedding in HTML, XHTML, Atom, RSS, and arbitrary XML.


Microformats Draft Specification 2009-11-10

Kavi Goel, Google
Authors/Contributers (alphabetical)
Tantek Çelik
Othar Hansson, Google
Jay Myers, Best Buy, Co., Inc.


Many websites publish reviews using a variety of organization schemes. hReview-aggregate and the similar microformat hReview were designed to enable sharing of review information.

hReview, created in 2006, is well suited to mark up reviews done by individuals on their own websites or for editor's reviews for a new product or service. However, in recent years, there has been an increasing number of sites who aggregate user reviews, either by accepting reviews submitted to their website or by collecting those user reviews from across the web. In these cases, it is often valuable to share not just the individual reviews shown on the webpage, but the consensus opinion derived from those individual reviews.

hReview-aggregate was created to address this need. hReview-aggregate is a standard that can be used to share the number of reviews, average rating, and consensus opinion for a particular product or service. It is meant to complement hReview and reuses hReview properties wherever appropriate. Research and discussion that fed into the design of hReview-aggregate can be found on the aggregate review brainstorming wiki page.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.


Collections of reviews consistently share several common aspects. Where possible hReview-aggregate has been based on this common subset.

Out of scope

Portions of reviews that are specific to particular kinds of items have been omitted from hReview-aggregate.



The hReview-aggregate schema consists of the following:

Property details

Details of the hReview-aggregate properties:

item:: This required property MUST have at a minimum the name of the entity being reviewed (using the subproperty "fn"), or alternatively have an encapsulated microformat (i.e. hCard for a business or person, hProduct for a product, or hCalendar for an event). If an encapsulated microformat is not used, a URI ("url") for the item and a photo or depiction ("photo") MAY also be provided. Non-URL unique item IDs (e.g. ISBNs, UPCs) MAY be represented as a URN ("url") for the item. Encapsulated microformats must be set on the item itself (e.g. class="item vcard"). However, when using item info subproperties ("fn", "url", "photo"), they must be nested inside the item element.

rating:: The rating is a fixed point integer (one decimal point of precision) from 1.0 to 5.0 inclusive indicating the average rating for the item across all reviews, higher indicating a better rating by default. Optionally a different integral "worst" value and/or "best" value may be specified to indicate a different range (e.g. 6 from 0-10).

count:: This property is used to specify the total number of reviews for the product or service.

votes:: This property is used to specify the total number of users who have rated the product or service, contributing to the average rating. For some sites, the number of votes is equal to the number of reviews, so count may be used and this property omitted.

summary:: This optional property can be the title for the review collection or a very short summary of the consensus opinion from the collection.

The item, rating, and summary properties are reused from hReview.


Basic example

Here is an example showing aggregate review information for a restaurant:

  <span>Mediterranean Wraps</span>
 <span>Customers flock to this small restaurant for their 
 tasty falafel and shawerma wraps and welcoming staff.</span>
 <span>4.5 out of 5 based on 17 reviews</span>

Adding hReview-aggregate markup to this is straightforward:

<div class="hreview-aggregate">
 <h3 class="item">
  <span class="fn">Mediterranean Wraps</span>
 <span class="summary">Customers flock to this small restaurant for their 
 tasty falafel and shawerma wraps and welcoming staff.</span>
 <span><span class="rating">4.5</span> out of 5 
 based on <span class="count">17</span> reviews</span>

Embedded microformat, 10-point rating scale

Often, there is more information available on a page about the item being reviewed than the title. Here is another example of a restaurant review, but with address information present.

  <h3>Mediterranean Wraps</h3>
  <span>433 S California Ave</span>
  <span>Palo Alto, CA
  <span>(650) 321-8189</span>
 <span>Customers flock to this small restaurant for their 
 tasty falafel and shawerma wraps and welcoming staff.</span>
 <span>9.2 out of 10 based on 17 reviews</span>

And here it is with hReview-aggregate markup, along with an embedded hCard to describe the address and phone information for the restaurant:

<div class="hreview-aggregate">
 <div class="item vcard">
  <h3 class="fn">Mediterranean Wraps</h3>
  <span class="adr">
   <span class="street-address">433 S California Ave</span>
   <span><span class="locality">Palo Alto</span>, <span class="region">CA</span></span>
   <span class="tel">(650) 321-8189</span>
 <span class="summary">Customers flock to this small restaurant for their 
 tasty falafel and shawerma wraps and welcoming staff.</span>
 <span class="rating"><span class="average">9.2</span> out of <span class="best">10</span> 
 based on <span class="count">17</span> reviews</span>

Note that the item and vcard are put next to each other in the same class attribute in order to show that the item being reviewed is described by the embedded hCard.

Hitung vs penilaian

Dalam contoh sejauh ini, jumlah </ code> properti telah digunakan tapi tidak <code> penilaian </ code>. <code> penilaian </ code> berguna ketika pengguna telah dinilai item tanpa menulis ulasan yang sesuai penuh. Suara mereka memberikan kontribusi terhadap nilai rata-rata tetapi tidak terhadap jumlah tinjauan

available.Consider contoh ini:
<nowiki> <div> <h3> <span> Wraps Mediterania </ span> </ h3>
Pelanggan <span> kawanan .. ke
restoran ini kecil untuk falafel mereka
lezat dan membungkus shawerma
dan ramah staf </ span> <span> 4.5
dari 5 berdasarkan 24 peringkat </ span> <span> 5 ulasan pengguna: </
span> ... < / div> </ Nowiki> </ pre>
Berikut contoh lagi, dengan kedua
hitung <code> </ code> dan <code>
penilaian </ code> ditentukan mana
yang sesuai. <pre> <nowiki> <div class = "hReview-agregat"> <h3
class="item"> <span class="fn">
Mediterania Wraps </ span> </ h3>
<span class="summary"> Pelanggan
berduyun-duyun ke restoran ini kecil
untuk falafel mereka lezat dan membungkus shawerma dan ramah
staf </ span> <span> <span
class="rating"> 4.5 </ span> dari 5
berdasarkan <span class="votes"> 24
</ span> </ span peringkat.. >
<span> <span class="count"> 5 </ span> ulasan pengguna: </ span> ...
</ div> </ Nowiki> </ pre>

== examples in the wild ==
This section is '''informative'''.

The following sites have implemented [[hReview-aggregate]], and thus are a great place to start for anyone looking for examples "in the wild" to try parsing, indexing, organizing etc. If your site is marked up with hReview aggregate, feel free to add it to the '''top''' of this list. Once the list grows too big, we'll make a separate wiki page like [[hreview-aggregate-examples-in-wild]] similar to [[hreview-examples-in-wild]].

* [] On this site I used the hReview-aggregate standard, you can see here one example: [ Rock’n’Heim]
* [ Icon Finance] has an hReview aggregate (though invisible, and count only 1).
* [ Easy Gap] uses hreview aggregate on a specific review page and homepage. Take a look at our review page here [ Easy Gap Insurance reviews]
* [ Gap Insurance 123] uses hreview aggregate on its Customer Testimonial, homepage and throughout the site. See here for example [ Gap Insurance testimonials]
* [ Jocuri de gatit] is a online games website and uses hreview aggregate on review, see here example [ Jocuri barbie]
* 2012-07-04: [ Auto Trader UK] rolled out hReview aggregate support (e.g. [ Used BMW 3 Series cars for sale]) and "... [ SERP updated almost instantly]".
* [ Essential Travel Insurance] uses hreview-aggregate which shows up nicely in a [ Google Search].
* [ Free SMS ohne Anmeldung kostenlos versenden] We use hreview-aggregate for our green stars user rating on the bottom of our page. Feel free to check and copy our source code (from line ~96) for an example.
* [ Mobile DJ Wirral] uses hreview aggregate on its Customer Review Pages. See here for example [ The Music Factory Disco]
* [ Houston Air Conditioning] uses hreview aggregate info on the bottom the the servicing webpages. See here for example [ AC Repair Katy]
* [ Kleinanzeigen kostenlos] ist die Plattform für gewerbliche und private Inserate mit Bild. Die Funktion wird in der Bewertung der Inserate durch Besucher verwendet. Siehe [ Ferienhaus Belgien]
* [ Spielplatztreff] is the playground rating website that implements hreview-aggregate and hreview for the userratings on each playground site e.g. [ Spielplatz in Bonn] 
* [ Lasting Power of Attorney] is a legal service website that uses hReview on its testimonial with a site wide aggregation [ Lasting Power of Attorney Guidance]
* [ PetFoodTalk], a pet food review and coupon site, implements hreview-aggregate for its presentation of dog food [ user ratings and reviews] and [ coupons] e.g. [ Blue Buffalo coupons] and [ reviews].
* [ DineHere] is a restaurant review site that publishes hreview-aggregates of hCards e.g. [ Blue Edge Organic Cafe].
* [ urbanspoon] is a restaurant review site that publishes hreview-aggregates e.g. [ 3 Friends Coffee House].
* [ Tickets Tour] is a community news site about concerts where users can rate music events (also marked up with hCalender). Example: [ Westernhagen]
* [ Golf Made Simple In Scotland] uses hReview-aggregate for a page of golf tour testimonials written by clients. Example: [ Golf tour testimonials].
** the 'hreview-aggregate' element is unfortunately set to style="display:none" - [[User:Tantek|Tantek]] 17:35, 10 October 2011 (UTC)
* [ ALA GAP Insurance] use hReview-aggregate on their home page based on hProduct/hReviews used throughout the site
* [ Epoxy Detroit] is a epoxy flooring and paint website that uses hReview on its footer that is site wide. View here for example [ Epoxy Paint Michigan]
* [ Citysearch] supports hReview-aggregate (e.g. [ Tulio Ristorante in Seattle] and [ Four Barrel in SF]) with a nested hCard for the venue.
** minor flaw: uses a capitalized form of the root class name: <code>hReview-aggregate</code> [[User:Tantek|Tantek]] 01:37, 22 July 2011 (UTC)
* [ Giga Music] is a community site where customers can rate different music and sport events (which are also marked up with hCalender). Example: [ David Garrett]
* [ CABS Car hire South Africa] Lists reviews submitted by customers on the customer testimonial page.  Example: [ car rental reviews]
* [ Trust a Friend] Lists reviews of products and services submitted by users and external blogs.  Example: [ J.George Plastering, Newent, Gloucestershire]
* CustomerLink Reviews has implemented hReview-aggregate for reviews of local businesses. Example: [ Review of Auto Tech & Tire]
* [ roofing seattle wa] uses hreview aggregate inside the footer of roofer website. See here for example [ Roof Repair Seattle]
* is a shopping search engine and price comparison site and offers an interesting implementation of hReview-aggregate and hProduct,  whereas typical e-commerce sites feature one store offer, this shopping search vertical site allows users to [ compare prices], therefore you can see an example of the 'price' class being utilized with nested tags that also features the 'pricerange' class - which can be seen on individual pages such as this comparison listing for the [ Apple iPod Touch 8GB]. The product information pages that have hReview-aggregate markup, also incorporate hProduct classes. hProduct has also been used on category menu pages such as this guide on [ Washing Machines] - where multiple instances of hProduct can be seen on a single page. In total, over 10+ million products and pages have been updated with hProduct and hReview-aggregate markup.

* [] has implemented hReview-aggregate for it's business ratings and reviews.
* Google has implemented support for [ hReview-aggregate] via [ Rich Snippets].
* [ STV Local] uses hreview-aggregate for business ratings, average prices and contact details with hcard
* [ Critiki] publishes ratings and reviews of Tiki bars, and uses hReview aggregate for average ratings on their pages, e.g. [ overview of The Tonga Room]. (as [ tweeted by humuhumu] 2009-09-21)
* [ NAPLESPLUS] is an example of a website that has implemented hreview-aggregate via Google specs.
*[ FriendsEAT] is an example of a food website that has implemented hreview-aggregate for it's restaurant and recipe ratings/reviews, e.g. [ Review of Churrascaria Plataforma]
* [] uses hreview-aggregate for concert ratings, and concert dates. Example: [ Robbie Williams Tour 2013]
* ...

== Related Pages ==

* [[hreview|hReview]] - microformat for marking up individual reviews
* [[aggregate-review-brainstorming|Aggregate review brainstorming]] - discussions leading to the creation of hReview-aggregate and ideas for improvement.
* [[aggregate-review-examples|Aggregate review examples]]

[[Category:Draft Specifications]]
hReview-aggregate 0.2 was last modified: Wednesday, December 31st, 1969