title: lore : a database management system for semistructured data. authors: roy goldman , serge abiteboul , jennifer widom , dallan quass , jason mchugh. venue: sigmod record. year: 1997
title: mocha : a self-extensible database middleware system for distributed data sources. authors: manuel rodr &#237; guez-mart &#237; nez , nick roussopoulos. venue: international conference on management of data. year: 2000