code: def _startXTVDNode(self, name, attrs):
          
  
          schemaVersion = attrs.get('schemaVersion')
          validFrom = self._parseDateTime(attrs.get('from'))
          validTo = self._parseDateTime(attrs.get('to'))
          self._progress.printMsg('Parsing version %s data from %s to %s' %
                                      (schemaVersion,
                                       validFrom.strftime('%Y/%m/%d'),
                                       validTo.strftime('%Y/%m/%d')))
docs: Process the start of the top-level xtvd node