Zhuo Chen Tok Wang Ling Mengchi Liu Gillian Dobbie XTree for Declarative XML Querying. 100-112 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2973&spage=100 2004 conf/dasfaa/2004 DASFAA db/conf/dasfaa/dasfaa2004.html#ChenLLD04