framework/application/data/src/main/java/org/ldp4j/application/data/PropertyHelperImpl.java
@Override
	public <T> T firstValue(final Class<? extends T> aClazz) {
		Property property=getProperty();
		if(property==null) {
			return null;
		}
		LiteralValueExtractor<T> extractor =LiteralValueExtractor.newInstance(aClazz);
		for(Value value:property) {
			value.accept(extractor);
			if(extractor.isAvailable()) {
				break;
			}
		}
		return extractor.getValue();
	}
@Override
	public <T> T firstValue(final Class<? extends T> aClazz) {
		Property property=getProperty();
		if(property==null) {
			return null;
		}
		LiteralValueExtractor<T> extractor =LiteralValueExtractor.newInstance(aClazz);
		for(Value value:property) {
			value.accept(extractor);
			if(extractor.isAvailable()) {
				break;
			}
		}
		return extractor.getValue();
	}
{@inheritDoc}