hreviewaggregate

hReviewaggregate, commonly written as hReview-aggregate, is a microformat used to mark up aggregated user reviews for a specific item on a webpage. It provides structured data that can be extracted by search engines and applications to present a concise summary of crowd feedback without parsing free text. The format is part of the family of microformats designed to embed semantic information in HTML.

Purpose and content: The primary purpose of hReviewaggregate is to convey the overall rating of an item, the number of contributing reviews, and the range of possible scores. Core properties typically include rating (the average score), count (the total number of reviews), best and worst (the upper and lower bounds of the rating scale). It may also reference the item being rated, allowing the aggregate to be associated with a product, service, or other entity. A textual summary can accompany the data to provide additional context.

Markup and structure: In HTML, an hReviewaggregate block is marked up with a container element assigned the class hreview-aggregate. Inside, elements carry classes such as rating for the average value, count for the total number of reviews, best and worst for scale bounds, and item or url to identify the rated item. Optional properties like summary can furnish a brief description of the aggregate rating.

Usage and status: hReviewaggregate was part of the early microformats ecosystem, alongside the hReview type for individual reviews. With the later emphasis on Schema.org and JSON-LD for structured data, its popularity declined, though it remains of historical interest and may appear on legacy pages that embedded microformats markup.

See also: Microformats, hReview, hReview-aggregate.