public void update()  throws MaltChainedException {
		final AddressValue a = addressFunction.getAddressValue();
		
		if (a.getAddress() == null) {
			if (getSymbolTable() != null) {
				featureValue.setIndexCode(getSymbolTable().getNullValueCode(NullValueId.NO_NODE));
				featureValue.setSymbol(getSymbolTable().getNullValueSymbol(NullValueId.NO_NODE));
			} else {
				featureValue.setIndexCode(0);
				featureValue.setSymbol("#null");
			}
//			featureValue.setKnown(true);
			featureValue.setNullValue(true);			
		} else {
			final DependencyNode node = (DependencyNode)a.getAddress();
			if (!node.isRoot()) {
				if (getSymbolTable() != null && node.hasLabel(getSymbolTable())) {
					featureValue.setIndexCode(node.getLabelCode(getSymbolTable()));
					featureValue.setSymbol(getSymbolTable().getSymbolCodeToString(node.getLabelCode(getSymbolTable())));
//					featureValue.setKnown(getSymbolTable().getKnown(node.getLabelCode(getSymbolTable())));
					featureValue.setNullValue(false);
				} else {
//						featureValue.setCode(0);
//						featureValue.setSymbol("#null");
					if (getSymbolTable() != null) {
						featureValue.setIndexCode(getSymbolTable().getNullValueCode(NullValueId.NO_VALUE));
						featureValue.setSymbol(getSymbolTable().getNullValueSymbol(NullValueId.NO_VALUE));
					} 
//						else {
//							featureValue.setCode(0);
//							featureValue.setSymbol("#null");
//						}
//					featureValue.setKnown(true);
					featureValue.setNullValue(true);
				}	
			} else {
				if (getSymbolTable() != null) {
					featureValue.setIndexCode(getSymbolTable().getNullValueCode(NullValueId.ROOT_NODE));
					featureValue.setSymbol(getSymbolTable().getNullValueSymbol(NullValueId.ROOT_NODE));
				} 
//					else {
//						featureValue.setCode(0);
//						featureValue.setSymbol("#null");
//					}
//					featureValue.setCode(0);
//					featureValue.setSymbol("#null");
//				featureValue.setKnown(true);
				featureValue.setNullValue(true);
			}
		}
		featureValue.setValue(1);
	}