code: @Override
  	public void assignValue(XAttribute attribute, String value) {
  		XCostExtension.instance().assignDriver(attribute, value);
  	}
docs: /* (non-Javadoc)
  @see org.deckfour.xes.extension.std.cost.XCostGenericSupport#assignValue(org.deckfour.xes.model.XAttributable, java.lang.Object)