def _extractDates(self):
"""Extract all date information from the DOM tree"""
dates_nodes = self._data.getElementsByTagName('dates')
if dates_nodes == []:
return
dates = LocaleDates()
calendars = self._extractCalendars(dates_nodes[0])
if calendars is not None:
dates.calendars = calendars
timezones = self._extractTimeZones(dates_nodes[0])
if timezones is not None:
dates.timezones = timezones
return dates
