AggregateRating: AggregateRating
In cboettig/schemar: Create Structured Data Using the Schema.org Vocabulary

The average rating based on multiple ratings or reviews.

AggregateRating(id = NULL, reviewCount = NULL, ratingCount = NULL,
  itemReviewed = NULL, worstRating = NULL, ratingValue = NULL,
  bestRating = NULL, author = NULL, url = NULL, sameAs = NULL,
  potentialAction = NULL, name = NULL, mainEntityOfPage = NULL,
  image = NULL, identifier = NULL, disambiguatingDescription = NULL,
  description = NULL, alternateName = NULL, additionalType = NULL)

`id`	identifier for the object (URI)
`reviewCount`	(Integer type.) The count of total number of reviews.
`ratingCount`	(Integer type.) The count of total number of ratings.
`itemReviewed`	(Thing or Thing type.) The item that is being reviewed/rated.
`worstRating`	(Text or Number type.) The lowest value allowed in this rating system. If worstRating is omitted, 1 is assumed.
`ratingValue`	(Text or Number type.) The rating for the content.
`bestRating`	(Text or Number type.) The highest value allowed in this rating system. If bestRating is omitted, 5 is assumed.
`author`	(Person or Organization or Person or Organization type.) The author of this content or rating. Please note that author is special in that HTML 5 provides a special mechanism for indicating authorship via the rel tag. That is equivalent to this and may be used interchangeably.
`url`	(URL type.) URL of the item.
`sameAs`	(URL type.) URL of a reference Web page that unambiguously indicates the item's identity. E.g. the URL of the item's Wikipedia page, Wikidata entry, or official website.
`potentialAction`	(Action type.) Indicates a potential Action, which describes an idealized action in which this thing would play an 'object' role.
`name`	(Text type.) The name of the item.
`mainEntityOfPage`	(URL or CreativeWork type.) Indicates a page (or other CreativeWork) for which this thing is the main entity being described. See [background notes](/docs/datamodel.html#mainEntityBackground) for details.
`image`	(URL or ImageObject type.) An image of the item. This can be a [[URL]] or a fully described [[ImageObject]].
`identifier`	(URL or Text or PropertyValue type.) The identifier property represents any kind of identifier for any kind of [[Thing]], such as ISBNs, GTIN codes, UUIDs etc. Schema.org provides dedicated properties for representing many of these, either as textual strings or as URL (URI) links. See [background notes](/docs/datamodel.html#identifierBg) for more details.
`disambiguatingDescription`	(Text type.) A sub property of description. A short description of the item used to disambiguate from other, similar items. Information from other properties (in particular, name) may be necessary for the description to be useful for disambiguation.
`description`	(Text type.) A description of the item.
`alternateName`	(Text type.) An alias for the item.
`additionalType`	(URL type.) An additional type for the item, typically used for adding more specific types from external vocabularies in microdata syntax. This is a relationship between something and a class that the thing is in. In RDFa syntax, it is better to use the native RDFa syntax - the 'typeof' attribute - for multiple types. Schema.org tools may have only weaker understanding of extra types, in particular those defined externally.