Andrei Arion Véronique Benzaken Ioana Manolescu Yannis Papakonstantinou Structured Materialized Views for XML Queries. 87-98 2007 conf/vldb/2007 VLDB http://www.vldb.org/conf/2007/papers/research/p87-arion.pdf db/conf/vldb/vldb2007.html#ArionBMP07