new_contents: # Copyright 2012 Rackspace
  #
  # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You 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.
  
  import logging
  
  from service_registry_cli.utils import BaseCommand, get_client
  
  
  class RemoveCommand(BaseCommand):
      """
      Remove a configuration value.
      """
      log = logging.getLogger(__name__)
  
      def get_parser(self, prog_name):
          parser = super(RemoveCommand, self).get_parser(prog_name=prog_name)
          parser.add_argument('--id', dest='id')
          return parser
  
      def take_action(self, parsed_args):
          client = get_client(parsed_args)
          configuration_id = parsed_args.id
          client.configuration.remove(configuration_id=configuration_id)
          self.app.stdout.write('Configuration value "%s" has been removed\n' %
                                (configuration_id))
  
subject: Add a command for removing a configuration value.