See our Review webmaster docs for full explanation of the Review type, and how to encode Review data in RDFa, microformats or microdata. This page exists to contain a machine-readable microdata description of the Review type itself (at the URI http://data-vocabulary.org/Review).
An item with the item type http://data-vocabulary.org/Review represents a review of a business, product or organization. The following are the type's defined property names

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Property	Description
itemreviewed (item)	The item being reviewed. In microformats, can include the name of the item reviewed (fn).
rating	A numerical quality rating for the item (for example, 4). You can indicate a rating scale by specifying best (default: 5) and worst (default: 1). More information about review ratings.
reviewer	The author of the review.
dtreviewed	The date that the item was reviewed in ISO date format.
description	The body of the review.
summary	A short summary of the review.