old_contents: # Licensed under a 3-clause BSD style license - see LICENSE.rst
  # -*- coding: utf-8 -*-
  
  import six
  
  from asdf.asdftypes import CustomType, ExtensionTypeMeta
  
  
  __all__ = ['AstropyType', 'AstropyAsdfType']
  
  
  _astropy_types = set()
  _astropy_asdf_types = set()
  
  
  class AstropyTypeMeta(ExtensionTypeMeta):
      """
      Keeps track of `AstropyType` subclasses that are created so that they can
      be stored automatically by astropy extensions for ASDF.
      """
      def __new__(mcls, name, bases, attrs):
          cls = super(AstropyTypeMeta, mcls).__new__(mcls, name, bases, attrs)
          # Classes using this metaclass are automatically added to the list of
          # astropy extensions
          if cls.organization == 'astropy.org' and cls.standard == 'astropy':
              _astropy_types.add(cls)
          elif cls.organization == 'stsci.edu' and cls.standard == 'asdf':
              _astropy_asdf_types.add(cls)
  
          return cls
  
  
  @six.add_metaclass(AstropyTypeMeta)
  class AstropyType(CustomType):
      """
      This class represents types that have schemas that are defined by Astropy.
      standard, but have tags that are implemented within astropy.
  
      IMPORTANT: This parent class should **not** be used for types that also
      have schemas that are defined by astropy.
      """
      organization = 'astropy.org'
      standard = 'astropy'
  
  
  @six.add_metaclass(AstropyTypeMeta)
  class AstropyAsdfType(CustomType):
      """
      This class represents types that have schemas that are defined in the ASDF
      standard, but have tags that are implemented within astropy.
  
      IMPORTANT: This parent class should **not** be used for types that also
      have schemas that are defined by astropy.
      """
      organization = 'stsci.edu'
      standard = 'asdf'
  
new_contents: # Licensed under a 3-clause BSD style license - see LICENSE.rst
  # -*- coding: utf-8 -*-
  
  import six
  
  from asdf.asdftypes import CustomType, ExtensionTypeMeta
  
  
  __all__ = ['AstropyType', 'AstropyAsdfType']
  
  
  _astropy_types = set()
  _astropy_asdf_types = set()
  
  
  class AstropyTypeMeta(ExtensionTypeMeta):
      """
      Keeps track of `AstropyType` subclasses that are created so that they can
      be stored automatically by astropy extensions for ASDF.
      """
      def __new__(mcls, name, bases, attrs):
          cls = super(AstropyTypeMeta, mcls).__new__(mcls, name, bases, attrs)
          # Classes using this metaclass are automatically added to the list of
          # astropy extensions
          if cls.organization == 'astropy.org' and cls.standard == 'astropy':
              _astropy_types.add(cls)
          elif cls.organization == 'stsci.edu' and cls.standard == 'asdf':
              _astropy_asdf_types.add(cls)
  
          return cls
  
  
  @six.add_metaclass(AstropyTypeMeta)
  class AstropyType(CustomType):
      """
      This class represents types that have schemas and tags that are defined by
      Astropy.
  
      IMPORTANT: This parent class should **not** be used for types that have
      schemas that are defined by the ASDF standard.
      """
      organization = 'astropy.org'
      standard = 'astropy'
  
  
  @six.add_metaclass(AstropyTypeMeta)
  class AstropyAsdfType(CustomType):
      """
      This class represents types that have schemas that are defined in the ASDF
      standard, but have tags that are implemented within astropy.
  
      IMPORTANT: This parent class should **not** be used for types that also
      have schemas that are defined by astropy.
      """
      organization = 'stsci.edu'
      standard = 'asdf'
  
subject: Fix comments in docstring for Astropy extensions