// *** C ***

@Label(standard = "&C")
@XmlBinding ( path = "c" )
@DependsOn(value = { "A", "B", })
ValueProperty PROP_C = new ValueProperty(TYPE, "C");

Value<String> getC();

void setC(String value);

public final class C_ValidationService extends ValidationService{

	@Override
	protected void initValidationService()
	{
		final Listener listener = new FilteredListener<PropertyContentEvent>(){
			@Override
			protected void handleTypedEvent( final PropertyContentEvent event )
			{
				broadcast();
			}
		};

		final X propX = context( X.class );

		propX.getA().attach(listener);
		propX.getB().attach(listener);
	}

        @Override
	protected Status compute() 
	{
           ...
	}
}

@Override
protected void initValidationService()
{
	final Listener listener = new FilteredListener<PropertyContentEvent>(){
		@Override
		protected void handleTypedEvent( final PropertyContentEvent event )
		{
			refresh();
		}
	};

	final X prop_X = context( X.class );
	for(Property property:prop_X.properties()){
		property.attach(listener);
	}
}