old_contents: from .department import Department
  from .organization import Organization
  from .ontology_word import OntologyWord
  from .ontology_tree_node import OntologyTreeNode
  from .unit import Unit
  from .keyword import Keyword
  from .unit_connection import UnitConnection
  from .unit_accessibility_property import UnitAccessibilityProperty
  from .accessibility_variable import AccessibilityVariable
  from .accessibility_sentence import AccessibilitySentence
  from .unit_identifier import UnitIdentifier
  from .unit_alias import UnitAlias
  from .service_mapping import ServiceMapping
new_contents: from .department import Department
  from .organization import Organization
  from .ontology_word import OntologyWord, UnitOntologyWordDetails
  from .ontology_tree_node import OntologyTreeNode
  from .unit import Unit
  from .keyword import Keyword
  from .unit_connection import UnitConnection
  from .unit_accessibility_property import UnitAccessibilityProperty
  from .accessibility_variable import AccessibilityVariable
  from .accessibility_sentence import AccessibilitySentence
  from .unit_identifier import UnitIdentifier
  from .unit_alias import UnitAlias
  from .service_mapping import ServiceMapping
  
subject: Add missing import