old_contents: """Python APIs for STIX 2.
  
  .. autosummary::
     :toctree: api
  
     confidence
     core
     datastore
     environment
     exceptions
     markings
     patterns
     properties
     utils
     v20.bundle
     v20.common
     v20.observables
     v20.sdo
     v20.sro
     v21.bundle
     v21.common
     v21.observables
     v21.sdo
     v21.sro
     workbench
  
  """
  
  # flake8: noqa
  
  from .confidence import scales
  from .core import _collect_stix2_mappings, parse, parse_observable
  from .datastore import CompositeDataSource
  from .datastore.filesystem import (
      FileSystemSink, FileSystemSource, FileSystemStore,
  )
  from .datastore.filters import Filter
  from .datastore.memory import MemorySink, MemorySource, MemoryStore
  from .datastore.taxii import (
      TAXIICollectionSink, TAXIICollectionSource, TAXIICollectionStore,
  )
  from .environment import Environment, ObjectFactory
  from .markings import (
      add_markings, clear_markings, get_markings, is_marked, remove_markings,
      set_markings,
  )
  from .patterns import (
      AndBooleanExpression, AndObservationExpression, BasicObjectPathComponent,
      BinaryConstant, BooleanConstant, EqualityComparisonExpression,
      FloatConstant, FollowedByObservationExpression,
      GreaterThanComparisonExpression, GreaterThanEqualComparisonExpression,
      HashConstant, HexConstant, InComparisonExpression, IntegerConstant,
      IsSubsetComparisonExpression, IsSupersetComparisonExpression,
      LessThanComparisonExpression, LessThanEqualComparisonExpression,
      LikeComparisonExpression, ListConstant, ListObjectPathComponent,
      MatchesComparisonExpression, ObjectPath, ObservationExpression,
      OrBooleanExpression, OrObservationExpression, ParentheticalExpression,
      QualifiedObservationExpression, ReferenceObjectPathComponent,
      RepeatQualifier, StartStopQualifier, StringConstant, TimestampConstant,
      WithinQualifier,
  )
  from .utils import new_version, revoke
  from .v20 import *  # This import will always be the latest STIX 2.X version
  from .version import __version__
  
  _collect_stix2_mappings()
  
  DEFAULT_VERSION = '2.0'  # Default version will always be the latest STIX 2.X version
  
new_contents: """Python APIs for STIX 2.
  
  .. autosummary::
     :toctree: api
  
     confidence
     core
     datastore
     environment
     exceptions
     markings
     patterns
     properties
     utils
     v20.bundle
     v20.common
     v20.observables
     v20.sdo
     v20.sro
     v21.bundle
     v21.common
     v21.observables
     v21.sdo
     v21.sro
     workbench
  
  """
  
  # flake8: noqa
  
  from .confidence import scales
  from .core import _collect_stix2_mappings, parse, parse_observable
  from .datastore import CompositeDataSource
  from .datastore.filesystem import (
      FileSystemSink, FileSystemSource, FileSystemStore,
  )
  from .datastore.filters import Filter
  from .datastore.memory import MemorySink, MemorySource, MemoryStore
  from .datastore.taxii import (
      TAXIICollectionSink, TAXIICollectionSource, TAXIICollectionStore,
  )
  from .environment import Environment, ObjectFactory
  from .markings import (
      add_markings, clear_markings, get_markings, is_marked, remove_markings,
      set_markings,
  )
  from .patterns import (
      AndBooleanExpression, AndObservationExpression, BasicObjectPathComponent,
      BinaryConstant, BooleanConstant, EqualityComparisonExpression,
      FloatConstant, FollowedByObservationExpression,
      GreaterThanComparisonExpression, GreaterThanEqualComparisonExpression,
      HashConstant, HexConstant, InComparisonExpression, IntegerConstant,
      IsSubsetComparisonExpression, IsSupersetComparisonExpression,
      LessThanComparisonExpression, LessThanEqualComparisonExpression,
      LikeComparisonExpression, ListConstant, ListObjectPathComponent,
      MatchesComparisonExpression, ObjectPath, ObservationExpression,
      OrBooleanExpression, OrObservationExpression, ParentheticalExpression,
      QualifiedObservationExpression, ReferenceObjectPathComponent,
      RepeatQualifier, StartStopQualifier, StringConstant, TimestampConstant,
      WithinQualifier,
  )
  from .utils import new_version, revoke
  from .v20 import *  # This import will always be the latest STIX 2.X version
  from .version import __version__
  
  _collect_stix2_mappings()
  
  DEFAULT_VERSION = '2.1'  # Default version will always be the latest STIX 2.X version
  
subject: Change stix2.DEFAULT_VERSION to "2.1" on the stix2.1 branch.