module TZInfo::TimezoneIndexDefinition

def self.append_features(base)

:nodoc:
methods used to define timezones in the index.
The timezone index file includes TimezoneIndexDefinition which provides 
def self.append_features(base)
  super
  base.extend(ClassMethods)
  base.instance_eval do
    @timezones = []
    @data_timezones = []
    @linked_timezones = []
  end
end