old_contents: 
  """Data schema classes"""
  
  class Schema(object):
      def __init__(self, name, title=None, desc=None, required=False):
          self.name = name
          self.title = title or name
          self.desc = desc
          self.required = required
  
  class StringSchema(Schema):
      def __init__(self, name, title=None, desc=None, required=False, default="",
                   multiline=False):
          super(StringSchema, self).__init__(name, title, desc, required)
          self.multiline = multiline
          self.default = default
  
  class IntegerSchema(Schema):
      def __init__(self, name, title=None, desc=None, required=False):
          super(IntegerSchema, self).__init__(name, title, desc, required)
  
  class MapSchema(Schema):
      """Homogeneous map from string to items"""
      def __init__(self, name, title=None, desc=None, required=False,
                   item=None):
          super(MapSchema, self).__init__(name, title, desc, required)
          self.item = item
  
  class ArraySchema(Schema):
      """A fixed array of items"""
      def __init__(self, name, title=None, desc=None, required=False, members=[]):
          super(ArraySchema, self).__init__(name, title, desc, required)
          self.members = members
  
  
new_contents: 
  """Data schema classes"""
  
  class Schema(object):
      def __init__(self, name, title=None, desc=None, required=False):
          self.name = name
          self.title = title or name
          self.desc = desc
          self.required = required
  
  class StringSchema(Schema):
      def __init__(self, name, title=None, desc=None, required=False, default="",
                   multiline=False):
          super(StringSchema, self).__init__(name, title, desc, required)
          self.multiline = multiline
          self.default = default
  
  class IntegerSchema(Schema):
      def __init__(self, name, title=None, desc=None, required=False, default=0):
          super(IntegerSchema, self).__init__(name, title, desc, required)
          self.default = default
  
  class MapSchema(Schema):
      """Homogeneous map from string to items"""
      def __init__(self, name, title=None, desc=None, required=False,
                   item=None):
          super(MapSchema, self).__init__(name, title, desc, required)
          self.item = item
  
  class ArraySchema(Schema):
      """A fixed array of items"""
      def __init__(self, name, title=None, desc=None, required=False, members=[]):
          super(ArraySchema, self).__init__(name, title, desc, required)
          self.members = members
  
  
subject: Add default to IntegerSchema