Concept Map VS Topic Map.

Dear All,
       i am doing some research in knowledge representation, there are many technologies to be used, and i am interested in both Topic Maps and Concept Map. can anyone enlighten me there differences on these two technologies. some difference has been point out on ... 
 
Concept Map emphasizes more on visual sense whereas TMs emphasized on mathematical sense.
 
Concept Map is formalized as named nodes and labeled arcs whereas TMs mainly deal withs TAOs and suchas.
 
so any more ideas on the differences,  or how to compare these two technologies, or what criteria should i concern.
 
 
 
 

		
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