Dao Dinh Kha Masatoshi Yoshikawa Shunsuke Uemura A Structural Numbering Scheme for XML Data. 91-108 2002 conf/edbtw/2002 EDBT Workshops http://dx.doi.org/10.1007/3-540-36128-6_6 db/conf/edbtw/edbtw2002.html#KhaYU02