title: data-driven understanding and refinement of schema mappings l yan , r miller , l haas , r fagin 2001. authors: nan. venue: sigmod conference. year: nan
title: r. : â ?? data-driven understanding and refinement of schema mappingsâ ?? lm yang , r haas , l fagin proc . acm sigmod conf . santa barbara , usa ,. authors: nan. venue: nan. year: nan