An instance of this class is returned by the
S.start() method as a token of elements whose start
tag has been written but whose end tag has not.
The constructor requires two arguments: the containing
Sox instance and the element name.
.end() method of the
Sox instance. This is the normal method
Does nothing; its existence is required by the Python context manager protocol.
.__exit__(self, exc_type, exc_value, traceback)
Required by the Python context manager protocol. Calls