A few of the schema structures used by Gmail differ from the
[schema.org](https://schema.org/) standard vocabulary. Google has worked with
the schema.org community to standardize its mail-related schemas so that
other email services and email clients can also take full advantage of them.
They have also been deeply integrated with numerous other improvements
at [schema.org](https://schema.org/docs/releases.html).

Google remains committed to updating its support of the schemas as adopted
at schema.org. When this process is complete, Google strives to make any
necessary transition as smooth as possible for all developers using these
schemas as well as for their users.

## List of Schema.org proposals

The following list identifies schema.org terms based on vocabulary proposals
from Gmail:

- [Action](https://schema.org/Action) - proposal: [Actions in Schema.org](https://www.w3.org/wiki/WebSchemas/ActivityActions)
- [Order](https://schema.org/Order) - proposal: [Orders in Schema.org](https://www.w3.org/wiki/WebSchemas/OrdersSchema)
- [Reservation](https://schema.org/Reservation) - proposal: [Reservations in Schema.org](https://www.w3.org/wiki/WebSchemas/ReservationsSchema)
- [EmailMessage](https://schema.org/EmailMessage) - proposal: [EmailMessage Type](https://www.w3.org/wiki/WebSchemas/EmailMessageSchema)

Schema.org vocabularies are developed through public discussions in the
[W3C Schema.org Community Group](https://www.w3.org/community/schemaorg/).