Ramez Elmasri Yu-Chi Wu Babak Hojabri Charley Li Jack Fu Conceptual Modeling for Customized XML Schemas. 429-443 2002 conf/er/2002 ER http://link.springer.de/link/service/series/0558/bibs/2503/25030429.htm db/conf/er/er2002.html#ElmasriWHLF02