… the tools that support them, we refer the reader to http://w3.org/xml and http://www.xmlinfo.com. 4 Today’s dominant database management systems (DBMS) are broad, mature products that will … sources, including both structured and semi-structured sources. 3 E.g., Poet <http://www.poet.com> and eXcelon <http://www.exceloncorp.com>. In fact, the latter company (formerly Object … 10 [7] A. Gonsalves, L. Pender, “Schema Fragmentation Takes a Bite out of XML”, in PC Week Online, May 3, 1999. http://www.zdnet.com/pcweek/stories/news/0,4153,401355,00.html. [8] J. …