@Override
	public void delete(Iterable<? extends StreamDefinition> entities) {
		for (StreamDefinition streamDefinition : entities) {
			this.delete(streamDefinition);
		}
	}
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