Hong Li Yang Jun Gang Han Ke Gang Hao The Common Semantic Constructs of XML Family. 416-431 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2885&spage=416 2003 conf/icfem/2003 ICFEM db/conf/icfem/icfem2003.html#YangHH03