Dump an XML document to a file. Will use compression if
          compiled in and enabled. If @filename is "-" the stdout
          file is used. If @format is set then the document will be
          indented on output. Note that @format = 1 provide node
          indenting only if xmlIndentTreeOutput = 1 or
           xmlKeepBlanksDefault(0) was called

def saveFormatFile(self, filename, format):
        """Dump an XML document to a file. Will use compression if
          compiled in and enabled. If @filename is "-" the stdout
          file is used. If @format is set then the document will be
          indented on output. Note that @format = 1 provide node
          indenting only if xmlIndentTreeOutput = 1 or
           xmlKeepBlanksDefault(0) was called """
        ret = libxml2mod.xmlSaveFormatFile(filename, self._o, format)
        return ret