ISKO Knowledge Organization

When Google searching "Wikipedia Knowledge Map", I found this Knowledge Map into Wikipedia ...

Knowledge 2008 ... Encyclopedic Portal
http://www.success.co.il/knowledge/encyclopedia/index.html

Which then led to the ISKO - International Society for Knowledge Organization.
http://www.isko.org/

The UK's site
http://www.iskouk.org/

has a blog ...
http://iskouk.blogspot.com/

which points to the KOnnect Blog
http://iskouk.wordpress.com/

Which led to topic map resources
http://iskouk.wordpress.com/knowledge-representation/topic-maps/resources/

Which points to Ontopia
http://www.ontopia.net/topicmaps/index.html

Which points to The TAO of Topic Maps
http://www.ontopia.net/topicmaps/materials/tao.html

From the introduction

Someone once said that "a book without an index is like a country without a map".

However interesting and worthwhile the experience of driving from A to B without a map might be in its own right, there can be no doubt that when the goal is to arrive at one's destination as quickly as possible (or at least without undue delay), some kind of a map is indispensable.

Similarly, if you are looking for a particular piece of information in a book (as opposed to enjoying the experience of reading it from cover to cover), a good index is an immense asset. The traditional back-of-book index can be likened to a carefully researched and hand-crafted map, and the task of the indexer, as Larry Bonura puts it [Bonura 1994], "to chart[ing] the topics of the document and [presenting] a concise and accurate map for readers."

In Troilus and Cressida Shakespeare used a different metaphor:

And in such indexes (although small pricks
To their subsequent volumes) there is seen
The baby figure of the giant mass
Of things to come at large

but also here there is the same sense of the index replicating, in miniature, the structures of its subject, in order to provide a more manageable view of the whole.

And wikipedia has something to say ...
http://en.wikipedia.org/wiki/Topic_Maps