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  # Copyright (c) 2015 GigaSpaces Technologies Ltd. All rights reserved
  #
  # 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.
  
  
  class Requirement(object):
  
      def __init__(self,
                   name,
                   parsed=False,
                   multiple_results=False,
                   required=True,
                   predicate=None):
          self.name = name
          self.parsed = parsed
          self.multiple_results = multiple_results
          self.required = required
          self.predicate = predicate
  
  
  class Value(Requirement):
  
      def __init__(self,
                   name,
                   multiple_results=False,
                   required=True,
                   predicate=None):
          super(Value, self).__init__(name,
                                      parsed=True,
                                      multiple_results=multiple_results,
                                      required=required,
                                      predicate=predicate)
  
  
  def sibling_predicate(source, target):
      return source.parent() == target.parent()
  