title: storing and querying ordered xml using a relational database system. authors: kevin s. beyer , jayavel shanmugasundaram , chun zhang , igor tatarinov , stratis viglas , eugene j. shekita. venue: sigmod conference. year: 2002
title: vxmlr : a visual xml-relational database system. authors: aoying zhou , hongjun lu , shihui zheng , yuqi liang , long zhang , wenyun ji , zengping tian. venue: very large data bases. year: 2001