Wan-Song Zhang Da-xin Liu ART Based Predictive Caching System for XML P2P Database. 3-10 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3252&spage=3 2004 conf/gcc/2004-w GCC Workshops db/conf/gcc/gcc2004-w.html#ZhangL04