[1] XML-Data (2006-06-19 18:34:57 +09:00 版) <http://www.w3.org/TR/1998/NOTE-XML-data-0105/>

[2] XML-Data (Jean Paoli著, 1997-06-23 14:37:56 +09:00) <https://lists.w3.org/Archives/Public/w3c-sgml-wg/1997Jun/0465.html>