old_contents: # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #    http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
  # implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from neutron_lib.api import extensions as api_extensions
  
  
  class Revisionifmatch(api_extensions.ExtensionDescriptor):
      """Indicate that If-Match constraints on revision_number are supported."""
  
      @classmethod
      def get_name(cls):
          return "If-Match constraints based on revision_number"
  
      @classmethod
      def get_alias(cls):
          return 'revision-if-match'
  
      @classmethod
      def get_description(cls):
          return ("Extension indicating that If-Match based on revision_number "
                  "is supported.")
  
      @classmethod
      def get_updated(cls):
          return "2016-12-11T00:00:00-00:00"
  
      @classmethod
      def get_resources(cls):
          return []
  
      def get_extended_resources(self, version):
          return {}
  
new_contents: # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #    http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
  # implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from neutron_lib.api.definitions import revisionifmatch as apidef
  from neutron_lib.api import extensions as api_extensions
  
  
  class Revisionifmatch(api_extensions.APIExtensionDescriptor):
      """Indicate that If-Match constraints on revision_number are supported."""
  
      api_definition = apidef
  
subject: use revision if match api def from neutron-lib