Google has recently updated their Review snippet structured data guidelines to limit the Schema ‘aggregateRating’ and ‘review’ properties to only a select handful of approved Schema types.
The upcoming release of the WPSSO JSON v2.10.0 add-on will follow these new Review snippet structured data guidelines, instead of conforming to the official Schema standard, as the current version does.
If you notice a “not a known valid target type for the itemReviewed property” error in Google structured data validator results, the ‘aggregateRating’ and/or ‘review’ may be included in a non-approved Schema type.
The official Schema standard provides ‘aggregateRating’ and ‘review’ properties for these Schema types (and all their sub-types):
After revising their Review snippet structured data guidelines, Google’s structured data validator now allows ‘aggregateRating’ and ‘review’ properties only for these Schema types:
- HowTo (includes the Recipe sub-type)
And the ‘review’ property for these Schema types: