see
XML Topic Maps (XTM) 1.0
TopicMaps.Org Specification (http://www.topicmaps.org/xtm/1.0/)
and
ISO/IEC JTC 1/SC34
Information Technology --
Document Description and Processing Languages
http://www.y12.doe.gov/sgml/sc34/document/0277.htm
"The HyTime-based meta-DTD uses HyTime varlinks, while the XTM DTD uses "simple" Xlinks"
David Steinberg
ottawa canada
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