title: vxmlr : a visual xml-relational database system. authors: a zhou , h lu , s zheng , y liang , l zhang , w ji , z tian. venue: vldb. year: 2001
title: texor : temporal xml database on an object-relational database system. authors: k nã ¸ rvag , m limstrand , l myklebust. venue: submitted for publication ,. year: 2002.0