title: qursed : querying and reporting semistructured data. authors: yannis papakonstantinou , michalis petropoulos , vasilis vassalos. venue: sigmod conference. year: 2002
title: extracting schema from semistructured data. authors: svetlozar nestorov , serge abiteboul , rajeev motwani. venue: international conference on management of data. year: 1998