title: timber : a native system for querying xml. authors: laks v. s. lakshmanan , stelios paparizos , nuwee wiwatwattana , cong yu , jignesh m. patel , h. v. jagadish , andrew nierman , divesh srivastava , adriane chapman , yuqing wu , shurug al-khalifa. venue: sigmod conference. year: 2003
title: xcache : a semantic caching system for xml queries. authors: li chen , elke a. rundensteiner , song wang. venue: international conference on management of data. year: 2002