public String isEmpty(DataFactory factory, Context c, HashMap map) {
		IVPBoolean isEmpty = factory.createIVPBoolean();
		boolean test = true;
		for (int i = 0; i < vectorRepresentation.length; i += 1) {
			if (vectorRepresentation[i] != IVPValue.NULL) {
				test = false;
				break;
			}
		}
		c.addBoolean(isEmpty.getUniqueID(), new Boolean(test));
		return isEmpty.getUniqueID();
	}