A few of the schema structures used by Gmail differ from the standard vocabulary. Google has worked with the 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

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

List of Proposals

The following list identifies terms based on vocabulary proposals from Gmail: vocabularies are developed through public discussions in the W3C Community Group.