Both attribute-based retrieval engines and natural language output interfaces require a significant design and programming effort, but users will reap tremendous benefits in terms of the power and flexibility in managing their data.

• 基于属性的检索工具和自然语言输出界面两者都需要巨大的设计和编程努力，但用户在管理数据的效能和灵活性方面会获得极大的好处。