text: from ....dependencies import DependentSet
  from ....features import wikitext
  from . import datasources, features
  
  
  class Stopwords(DependentSet):
      """
      :Parameters:
          name : `str`
              A name for the collection
          stopword_set : `set` ( `str` )
              A set of stopwords
      """
  
      def __init__(self, name, stopword_set):
          super().__init__(name)
          word_is_stopword = WordIsInStopwordSet(stopword_set)
  
          self.revision = features.Revision(
              name + ".revision",
              datasources.Revision(name + ".revision", word_is_stopword,
                                   wikitext.revision.datasources)
          )
          """
          :class:`~revscoring.languages.features.stopwords.Revision` :
          The base revision feature set.
          """
  
  
  class WordIsInStopwordSet:
  
      def __init__(self, stopword_set, cleanup=None):
          self.stopword_set = stopword_set
  
      def __call__(self, word):
          return word.lower() in self.stopword_set
  