As an effective way of extracting desired information, keyword search on XML data has been a hot research issue along with the ever increasing of XML-based applications, and large volumes of research work appear on various top-level conferences and journals each year. In this paper, we organize existing works according to the architecture of an XML keyword search system, and give an in depth analysis to the representative techniques from five aspects, I. E. , query generation, query semantics, ranking mechanism, query processing algorithms and result presentation. Finally, according to the requirements of latest applications, we conclude open research problems according to the inherent requirement of effectiveness and efficiency.%关键字查询作为一种有效的信息检索手段,一直以来都是XML数据管理领域研究的热点问题,每年均有大量最新研究成果出现在各种顶级会议和期刊上.针对众多国内外研究者在XML关键字查询领域所作出的创新性工作,该文以XML关键字查询处理系统为框架来组织现有工作,重点分析和比较了查询生成、语义定义、排序机制、查询算法及结果展示等5个关键技术点所涉及的代表性工作的特点,并结合最新的应用需求从有效性和高效性的角度归纳出XML关键字查询技术后续研究面临的问题和挑战.
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