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XML Topic Maps
Topic maps allow you to define the metadata of Web sites and XML documents. XML Topic Maps or XTM is a specification for defining knowledge resources.
Easy Topic Maps
A great resource site.
The TAO of Topic Maps
Topic maps are a huge subject, but this overview covers all the aspects in a clear and descriptive format.
Topic Map Cartography
This is an examination of authoring topic maps.
Topic Maps.Net
Lots of information and resources on topic maps.
XML Topic Maps Specification
XTM specification is explained and detailed.
XTM: Topic Maps.Org
This is the original XTM Web site for developing topic maps for the Web.