Muralidhar Krishnaprasad Zhen Hua Liu Daniela Florescu Anand Manikutty James W. Warner Conquering the Heterogeneity and Evolutionary Nature of XML Using XML Union Views. 234-240 2006 conf/dba/2006 Databases and Applications db/conf/dba/dba2006.html#KrishnaprasadLFMW06