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Motivation

How do you encode the piece of knowledge:
"The theory of relativity was discovered by Albert Einstein" 

<theory>                                        
  <name>Theory of Relativity</name>             
  <discoverer>Albert Einstein</discoverer>      
</theory>                                       

______________________ or _________________________
<person>                                              
<name>Albert Einstein</name>                        
  <discovered>Theory of Relativity</discovered>    
</person>                                        
______________________ or _________________________
<person name="Albert Einstein">                
  <discovered>Theory of Relativity</discovered>
</person>                                      
___________________________________________________
There is no unique way (in XML) to represent knowledge.
Information represented in such ways is not easy to integrate. (Why?)
RDF helps to solve this problem.

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