Model for OSF APIv2 node links. This model may refer to one of several API endpoints. It may be queried directly, or accessed via relationship fields. For field and usage information, see:

• https://api.osf.io/v2/docs/#!/v2/Node_Links_List_GET
• https://api.osf.io/v2/docs/#!/v2/Node_Links_Detail_GET
• https://api.osf.io/v2/docs/#!/v2/Registration_Node_Links_List_GET
• https://api.osf.io/v2/docs/#!/v2/Registration_Node_Links_Detail_GET