def __init__(self, name="<STR_LIT>", value="<STR_LIT>", unit=None):
self.__name = name.upper()<EOL>self.__value = value<EOL>self.__unit = unit<EOL>
Optional arguments:
 | ``name``  --  The keyword name
 | ``value``  --  The associated value
 | ``unit``  --  The unit (user must guarantee validity of the unit)