title: anatomy of a native xml base management system. authors: thorsten fiebig , till westmann , robert schiele , guido moerkotte , carl-christian kanne , julia neumann , sven helmer. venue: vldb j.. year: 2002
title: unisql 's next-generation object-relational database management system. authors: albert d'andrea , phil janus. venue: acm sigmod record. year: 1996