Model for OSF APIv2 draft registrations. This model represents draft registration data and can be accessed as a relationship of a node. For information on how to interact with a node's draft registrations, see:

• https://api.osf.io/v2/docs/#!/v2/Node_Draft_Registrations_List_GET
• https://api.osf.io/v2/docs/#!/v2/Node_Draft_Registration_Detail_GET