VIAVI TestCenter: HLTAPI version t4.22- How do we load the previously saved configuration as xml?

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VIAVI TestCenter: HLTAPI version t4.22- How do we load the previously saved configuration as xml?
We have to use "sth::load_xml" command. Purpose: Loads test configurations from a previously saved XML file, and returns a VIAVI TestCenter project handle. Synopsis: sth::load_xml [-filename]   Argument: -filename Specifies the path of the XML file. This argument is mandatory.   Return Values: The function returns a keyed list using the following keys (with corresponding data):   handle VIAVI TestCenter project handle   status Success (1) or failure (0) of the operation   log An error message (if the operation failed)