Lina Al-Jadir Fatmé El-Moukaddem Once Upon a Time a DTD Evolved into Antother DTD. 3-17 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2817&spage=3 2003 conf/oois/2003 OOIS db/conf/oois/oois2003.html#Al-JadirE03