v.add(inputSource.getValidity());
if (inputSource.getValidity() != null) v.add(inputSource.getValidity());
	public SourceValidity getValidity() {		if (cacheValidity != -1) {			AggregatedValidity v = new AggregatedValidity();			v.add(inputSource.getValidity());			v.add(new ExpiresValidity(cacheValidity));			return v;		}		return null;	}