public void parseXSDDuration(String xsdDuration) throws LtInvalidValueException
  Property Description  
    Argument xsdDuration valid XML Schema duration as a string  
    Description Populates this - XmlDateTimeSpan with the value specified as a valid XML Schema duration.  
    Remarks A duration takes the form [-]P[nY][nM][nD][T[nH][nM][nS.ff]]