return value.equals(v.value);
if(value!=null) { return value.equals(v.value); } else { if(v.value==null) { return true; } } return false;
	public boolean equals(Object obj) {		if (obj == null || !(obj instanceof StringValue)) {			return false;		}		StringValue v = (StringValue) obj;		if (unitType != v.unitType) {			return false;		}		return value.equals(v.value);	}