Embedded entities inherit certain fields from general entities as they are also one of the persisted entity types. Unlike their counterparts, they cannot be created-read-updated-deleted directly and must be accessed through their master general entities, or "headers."
To reflect this design. the
_id fields are not required since embedded entities are referenced with their headers.
Timestamp in seconds since 1, Jan. 1970, indicating when this object was created.
Timestamp in seconds since 1, Jan. 1970, indicating when this object was last updated (including creation).
The ID of this object.