Hello,   
      
   You said :   
   "1.  A knowledgebase is usually very much smaller than a database --   
   maybe a few hundred concepts organized hierarchically at most. "   
      
   I'm not sure you're right.   
   I 've found this definition :   
   "Knowledge Base - An ontology populated with data."   
   (http://www.noisebetweenstations.com/personal/essays/metadata_gl   
   ssary/metadata_glossary.html)   
      
   So according to this definition a knowledge base can be as big as a   
   database.   
      
   Salutations   
      
   Mathieu   
      
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