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A common type of markup is reviews.
For instance, when users search for a product or
service, like a book or restaurant, it's useful to be
able to show them a review directly in the
search results snippet.
In order for your reviews to properly display as a rich
snippet, there are a few properties that you should
mark up in your HTML--
the item being reviewed and the items rating, as well as
who the reviewer is and when they wrote the review.
You can also mark up the body of the review
and a review summary.
Let's take a look at a microwave review.
Using schema.org markup, start by indicating the type of
element you're marking up.
In this case, a review nested in a product element.
Mark up the review description if you have one, the author of
the review, the date it was published, and the body of the
review itself.
If you need to provide information in a different
format than what is visible to users on the page,
use the meta tag.
In this case, the date that's visible to the
user is April 1, 2011.
But we need to mark it up in ISO format.
So we'll use the meta tag.
To include a rating, nest a rating element right in your
review's review rating property.
A rating can include the rating value itself, as well
as a best value.
Google will normalize your rating on a five-point scale
using these values.
If your page shows multiple reviews, you can mark it up to
show rich snippets, just like you can for a
single review page.
Let's look again at the microwave example.
Now that I have a few reviews, I'm going to add a
review-aggregate.
Just like a single review, mark up the rating along with
a best value.
Also include the total number of reviews on the page using
review count, or the total number of votes without a
review using rating count.
If you use review count, make sure that the page actually
contains review markup for each review.