old_contents: """
  Data models for the core Sana data engine. These should be extended as 
  required. 
  
  :Authors: Sana dev team
  :Version: 2.0
  """
  
  from sana.core.models.concept import Concept, Relationship, RelationshipCategory
  from sana.core.models.device import Device
  from sana.core.models.encounter import Encounter
  from sana.core.models.events import Event
  from sana.core.models.notification import Notification
  from sana.core.models.observation import Observation
  from sana.core.models.observer import Observer
  from sana.core.models.procedure import Procedure
  from sana.core.models.subject import Subject
  
  __all__ = ['Concept', 'Relationship','RelationshipCategory',
             'Device', 
             'Encounter',
             'Event',
             'Notification', 
             'Observation', 
             'Observer',
             'Procedure',
             'Subject',]
  
  
new_contents: """
  Data models for the core Sana data engine. These should be extended as 
  required. 
  
  :Authors: Sana dev team
  :Version: 2.0
  """
  
  from .concept import Concept, Relationship, RelationshipCategory
  from .device import Device
  from .encounter import Encounter
  from .events import Event
  from .notification import Notification
  from .observation import Observation
  from .observer import Observer
  from .procedure import Procedure
  from .subject import Patient
  
  __all__ = ['Concept', 'Relationship','RelationshipCategory',
             'Device', 
             'Encounter',
             'Event',
             'Notification', 
             'Observation', 
             'Observer',
             'Procedure',
             'Patient',]
  
  
subject: Update to use relative imports.