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Clio is an existing schema-mapping tool that provides user-friendly means to manage and facilitate the complex task of transformation and integration of heterogeneous data such as XML over the Web or in XML databases. By means of mappings from source to target schemas, Clio can help users conveniently establish the precise semantics of data transformation and integration. In this paper we study the problem of how to efficiently implement such data transformation (i.e., generating target datadoi:10.1145/1242572.1242715 dblp:conf/www/JiangHPH07 fatcat:tolptkegc5ga5dirue75pwhtfa