@Override
	public <S extends StreamDefinition> Iterable<S> save(Iterable<S> entities) {
		List<S> results = new ArrayList<S>();
		for (S entity : entities) {
			results.add(this.save(entity));
		}
		return results;
	}
The key used in serialized properties to hold the parsed module definitions that make up a stream.
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/stream/zookeeper/ZooKeeperStreamDefinitionRepository.java