[1]XML Topic Maps (XTM) 1.0 (10/25/2005, 2:11:49 PM 版) <http://www.topicmaps.org/xtm/1.0/xtm1-20010806.html>

[2] ISO 13250-2: Topic Maps — Data Model (6/4/2008, 1:00:09 PM 版) <http://www.isotopicmaps.org/sam/>