Stéphane Bressan Zoé Lacroix Ying Guang Li Anna Maddalena Prune XML Before You Search It: XML Transformations for Query Optimization. 270-279 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3268&spage=270 2004 conf/edbtw/2004 EDBT Workshops db/conf/edbtw/edbtw2004.html#BressanLLM04