George H. L. Fletcher Dirk Van Gucht Yuqing Wu Marc Gyssens Jan Paredaens Coupling Fragments of XPath with XML Indexing and Query Decomposition. 2007 EROW http://ceur-ws.org/Vol-229/paper4.pdf conf/icdt/2007erow db/conf/icdt/erow2007.html#FletcherGWGP07